21038697 has 12 divisors (see below), whose sum is σ = 31515120. Its totient is φ = 14025636.

The previous prime is 21038687. The next prime is 21038713. The reversal of 21038697 is 79683012.

It is not a de Polignac number, because 21038697 - 2⁸ = 21038441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21038627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43047 + ... + 43532.

It is an arithmetic number, because the mean of its divisors is an integer number (2626260).

Almost surely, 2^21038697 is an apocalyptic number.

21038697 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21038697 is a deficient number, since it is larger than the sum of its proper divisors (10476423).

21038697 is an frugal number, since it uses more digits than its factorization.

21038697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86594 (or 86582 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21038697 is about 4586.7959405232. The cubic root of 21038697 is about 276.0617772866.

The spelling of 21038697 in words is "twenty-one million, thirty-eight thousand, six hundred ninety-seven".