21150038 has 32 divisors (see below), whose sum is σ = 39567360. Its totient is φ = 8255520.

The previous prime is 21150037. The next prime is 21150043. The reversal of 21150038 is 83005112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13643 + ... + 15113.

It is an arithmetic number, because the mean of its divisors is an integer number (1236480).

Almost surely, 2^21150038 is an apocalyptic number.

21150038 is a deficient number, since it is larger than the sum of its proper divisors (18417322).

21150038 is a wasteful number, since it uses less digits than its factorization.

21150038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21150038 is about 4598.9170464360. The cubic root of 21150038 is about 276.5479121313.

The spelling of 21150038 in words is "twenty-one million, one hundred fifty thousand, thirty-eight".