21282156 has 48 divisors (see below), whose sum is σ = 63060480. Its totient is φ = 6080400.

The previous prime is 21282139. The next prime is 21282167. The reversal of 21282156 is 65128212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13320 + ... + 14831.

It is an arithmetic number, because the mean of its divisors is an integer number (1313760).

Almost surely, 2^21282156 is an apocalyptic number.

It is an amenable number.

21282156 is an abundant number, since it is smaller than the sum of its proper divisors (41778324).

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

21282156 is a wasteful number, since it uses less digits than its factorization.

21282156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28171 (or 28163 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 21282156 is about 4613.2587180864. The cubic root of 21282156 is about 277.1225547786.

The spelling of 21282156 in words is "twenty-one million, two hundred eighty-two thousand, one hundred fifty-six".