21150156 has 24 divisors (see below), whose sum is σ = 51496704. Its totient is φ = 6743440.

The previous prime is 21150139. The next prime is 21150163. The reversal of 21150156 is 65105112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38040 + ... + 38591.

It is an arithmetic number, because the mean of its divisors is an integer number (2145696).

Almost surely, 2^21150156 is an apocalyptic number.

It is an amenable number.

21150156 is an abundant number, since it is smaller than the sum of its proper divisors (30346548).

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

21150156 is a wasteful number, since it uses less digits than its factorization.

21150156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76661 (or 76659 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 21150156 is about 4598.9298755254. The cubic root of 21150156 is about 276.5484264344.

Adding to 21150156 its reverse (65105112), we get a palindrome (86255268).

The spelling of 21150156 in words is "twenty-one million, one hundred fifty thousand, one hundred fifty-six".