21151038 has 16 divisors (see below), whose sum is σ = 42428160. Its totient is φ = 7029336.

The previous prime is 21151027. The next prime is 21151049. The reversal of 21151038 is 83015112.

It is an interprime number because it is at equal distance from previous prime (21151027) and next prime (21151049).

It is a Curzon number.

It is a congruent number.

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, 2998 + ... + 7161.

It is an arithmetic number, because the mean of its divisors is an integer number (2651760).

Almost surely, 2^21151038 is an apocalyptic number.

21151038 is an abundant number, since it is smaller than the sum of its proper divisors (21277122).

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

21151038 is a wasteful number, since it uses less digits than its factorization.

21151038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 21151038 is about 4599.0257663988. The cubic root of 21151038 is about 276.5522705719.

The spelling of 21151038 in words is "twenty-one million, one hundred fifty-one thousand, thirty-eight".