21622612 has 12 divisors (see below), whose sum is σ = 41279616. Its totient is φ = 9828440.

The previous prime is 21622607. The next prime is 21622613.

21622612 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245668 + ... + 245755.

It is an arithmetic number, because the mean of its divisors is an integer number (3439968).

Almost surely, 2^21622612 is an apocalyptic number.

21622612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21622612 is a deficient number, since it is larger than the sum of its proper divisors (19657004).

21622612 is a wasteful number, since it uses less digits than its factorization.

21622612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491438 (or 491436 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 21622612 is about 4650.0120429952. The cubic root of 21622612 is about 278.5924772424.

It can be divided in two parts, 2162 and 2612, that added together give a palindrome (4774).

The spelling of 21622612 in words is "twenty-one million, six hundred twenty-two thousand, six hundred twelve".