21034156 has 36 divisors (see below), whose sum is σ = 43585696. Its totient is φ = 8822880.

The previous prime is 21034133. The next prime is 21034183. The reversal of 21034156 is 65143012.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4621 + ... + 7963.

Almost surely, 2^21034156 is an apocalyptic number.

21034156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21034156 is an abundant number, since it is smaller than the sum of its proper divisors (22551540).

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

21034156 is a wasteful number, since it uses less digits than its factorization.

21034156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382 (or 3369 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21034156 is about 4586.3009059590. The cubic root of 21034156 is about 276.0419140994.

Adding to 21034156 its reverse (65143012), we get a palindrome (86177168).

The spelling of 21034156 in words is "twenty-one million, thirty-four thousand, one hundred fifty-six".