21461156 has 6 divisors (see below), whose sum is σ = 37557030. Its totient is φ = 10730576.

The previous prime is 21461137. The next prime is 21461173. The reversal of 21461156 is 65116412.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 3534400 = 4234^2 + 1880^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2682641 + ... + 2682648.

It is an arithmetic number, because the mean of its divisors is an integer number (6259505).

Almost surely, 2^21461156 is an apocalyptic number.

It is an amenable number.

21461156 is a deficient number, since it is larger than the sum of its proper divisors (16095874).

21461156 is a wasteful number, since it uses less digits than its factorization.

21461156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365293 (or 5365291 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 21461156 is about 4632.6186978857. The cubic root of 21461156 is about 277.8973276460.

Adding to 21461156 its reverse (65116412), we get a palindrome (86577568).

The spelling of 21461156 in words is "twenty-one million, four hundred sixty-one thousand, one hundred fifty-six".