221026156 has 36 divisors (see below), whose sum is σ = 430517136. Its totient is φ = 98699040.

The previous prime is 221026151. The next prime is 221026171. The reversal of 221026156 is 651620122.

It is a super-2 number, since 2×221026156² = 97705123272272672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221026156.

It is not an unprimeable number, because it can be changed into a prime (221026151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47761 + ... + 52183.

Almost surely, 2^221026156 is an apocalyptic number.

221026156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221026156 is a deficient number, since it is larger than the sum of its proper divisors (209490980).

221026156 is a wasteful number, since it uses less digits than its factorization.

221026156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4502 (or 4469 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 221026156 is about 14866.9484427706. The cubic root of 221026156 is about 604.6182105006.

Adding to 221026156 its reverse (651620122), we get a palindrome (872646278).

The spelling of 221026156 in words is "two hundred twenty-one million, twenty-six thousand, one hundred fifty-six".