21406148 has 12 divisors (see below), whose sum is σ = 37493820. Its totient is φ = 10693632.

The previous prime is 21406109. The next prime is 21406153. The reversal of 21406148 is 84160412.

It can be written as a sum of positive squares in 2 ways, for example, as 9351364 + 12054784 = 3058^2 + 3472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6140 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (3124485).

Almost surely, 2^21406148 is an apocalyptic number.

It is an amenable number.

21406148 is a deficient number, since it is larger than the sum of its proper divisors (16087672).

21406148 is a wasteful number, since it uses less digits than its factorization.

21406148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726 (or 4724 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21406148 is about 4626.6778578155. The cubic root of 21406148 is about 277.6596943550.

The spelling of 21406148 in words is "twenty-one million, four hundred six thousand, one hundred forty-eight".