21438802 has 64 divisors (see below), whose sum is σ = 44789760. Its totient is φ = 7430400.

The previous prime is 21438793. The next prime is 21438827. The reversal of 21438802 is 20883412.

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, 49527 + ... + 49957.

It is an arithmetic number, because the mean of its divisors is an integer number (699840).

Almost surely, 2^21438802 is an apocalyptic number.

21438802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21438802 is an abundant number, since it is smaller than the sum of its proper divisors (23350958).

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

21438802 is a wasteful number, since it uses less digits than its factorization.

21438802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 21438802 is about 4630.2053950122. The cubic root of 21438802 is about 277.8008079157.

The spelling of 21438802 in words is "twenty-one million, four hundred thirty-eight thousand, eight hundred two".