21038534 has 24 divisors (see below), whose sum is σ = 35136504. Its totient is φ = 9369600.

The previous prime is 21038531. The next prime is 21038539. The reversal of 21038534 is 43583012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038531) 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, 81734 + ... + 81990.

It is an arithmetic number, because the mean of its divisors is an integer number (1464021).

Almost surely, 2^21038534 is an apocalyptic number.

21038534 is a deficient number, since it is larger than the sum of its proper divisors (14097970).

21038534 is a wasteful number, since it uses less digits than its factorization.

21038534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21038534 is about 4586.7781720942. The cubic root of 21038534 is about 276.0610643435.

The spelling of 21038534 in words is "twenty-one million, thirty-eight thousand, five hundred thirty-four".