21223038 has 64 divisors (see below), whose sum is σ = 48522240. Its totient is φ = 6147072.

The previous prime is 21223009. The next prime is 21223051. The reversal of 21223038 is 83032212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90970 + ... + 91202.

It is an arithmetic number, because the mean of its divisors is an integer number (758160).

Almost surely, 2^21223038 is an apocalyptic number.

21223038 is an abundant number, since it is smaller than the sum of its proper divisors (27299202).

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

21223038 is a wasteful number, since it uses less digits than its factorization.

21223038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21223038 is about 4606.8468609234. The cubic root of 21223038 is about 276.8657179515.

The spelling of 21223038 in words is "twenty-one million, two hundred twenty-three thousand, thirty-eight".