21106948 has 36 divisors (see below), whose sum is σ = 39940992. Its totient is φ = 9753840.

The previous prime is 21106933. The next prime is 21106957. The reversal of 21106948 is 84960112.

21106948 = 647² + 648² + ... + 693².

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67713 + ... + 68023.

It is an arithmetic number, because the mean of its divisors is an integer number (1109472).

Almost surely, 2^21106948 is an apocalyptic number.

It is an amenable number.

21106948 is a deficient number, since it is larger than the sum of its proper divisors (18834044).

21106948 is a wasteful number, since it uses less digits than its factorization.

21106948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21106948 is about 4594.2298592909. The cubic root of 21106948 is about 276.3599762773.

The spelling of 21106948 in words is "twenty-one million, one hundred six thousand, nine hundred forty-eight".