222621012 has 18 divisors (see below), whose sum is σ = 562736538. Its totient is φ = 74206992.

The previous prime is 222620969. The next prime is 222621029. The reversal of 222621012 is 210126222.

222621012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 222487056 + 133956 = 14916^2 + 366^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×222621012² = 99120229967808288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3091923 + ... + 3091994.

It is an arithmetic number, because the mean of its divisors is an integer number (31263141).

Almost surely, 2^222621012 is an apocalyptic number.

It is an amenable number.

222621012 is an abundant number, since it is smaller than the sum of its proper divisors (340115526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222621012 is a wasteful number, since it uses less digits than its factorization.

222621012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183927 (or 6183922 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 222621012 is about 14920.4896702488. The cubic root of 222621012 is about 606.0689723149.

Adding to 222621012 its reverse (210126222), we get a palindrome (432747234).

It can be divided in two parts, 2226210 and 12, that added together give a palindrome (2226222).

The spelling of 222621012 in words is "two hundred twenty-two million, six hundred twenty-one thousand, twelve".