21838948 has 24 divisors (see below), whose sum is σ = 40628952. Its totient is φ = 10235904.

The previous prime is 21838919. The next prime is 21838951. The reversal of 21838948 is 84983812.

It can be written as a sum of positive squares in 4 ways, for example, as 2985984 + 18852964 = 1728^2 + 4342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22440 + ... + 23392.

It is an arithmetic number, because the mean of its divisors is an integer number (1692873).

Almost surely, 2^21838948 is an apocalyptic number.

It is an amenable number.

21838948 is a deficient number, since it is larger than the sum of its proper divisors (18790004).

21838948 is a wasteful number, since it uses less digits than its factorization.

21838948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 1309 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 21838948 is about 4673.2160232542. The cubic root of 21838948 is about 279.5185092330.

The spelling of 21838948 in words is "twenty-one million, eight hundred thirty-eight thousand, nine hundred forty-eight".