21499038 has 36 divisors (see below), whose sum is σ = 51206064. Its totient is φ = 6514200.

The previous prime is 21499021. The next prime is 21499039. The reversal of 21499038 is 83099412.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21498993 and 21499011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21499039) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2758 + ... + 7113.

Almost surely, 2^21499038 is an apocalyptic number.

21499038 is an abundant number, since it is smaller than the sum of its proper divisors (29707026).

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

21499038 is a wasteful number, since it uses less digits than its factorization.

21499038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901 (or 9887 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 21499038 is about 4636.7055114596. The cubic root of 21499038 is about 278.0607410018.

The spelling of 21499038 in words is "twenty-one million, four hundred ninety-nine thousand, thirty-eight".