21038416 has 20 divisors (see below), whose sum is σ = 46585312. Its totient is φ = 9016416.

The previous prime is 21038393. The next prime is 21038419. The reversal of 21038416 is 61483012.

It is a super-2 number, since 2×21038416² = 885229895578112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93810 + ... + 94033.

Almost surely, 2^21038416 is an apocalyptic number.

It is an amenable number.

21038416 is an abundant number, since it is smaller than the sum of its proper divisors (25546896).

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

21038416 is a wasteful number, since it uses less digits than its factorization.

21038416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187858 (or 187852 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21038416 is about 4586.7653090168. The cubic root of 21038416 is about 276.0605482228.

The spelling of 21038416 in words is "twenty-one million, thirty-eight thousand, four hundred sixteen".