21177124 has 6 divisors (see below), whose sum is σ = 37059974. Its totient is φ = 10588560.

The previous prime is 21177097. The next prime is 21177131. The reversal of 21177124 is 42177112.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 3385600 = 4218^2 + 1840^2 .

It is a super-2 number, since 2×21177124² = 896941161822752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2647137 + ... + 2647144.

Almost surely, 2^21177124 is an apocalyptic number.

It is an amenable number.

21177124 is a deficient number, since it is larger than the sum of its proper divisors (15882850).

21177124 is a wasteful number, since it uses less digits than its factorization.

21177124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5294285 (or 5294283 counting only the distinct ones).

The product of its digits is 784, while the sum is 25.

The square root of 21177124 is about 4601.8609279290. The cubic root of 21177124 is about 276.6659163542.

The spelling of 21177124 in words is "twenty-one million, one hundred seventy-seven thousand, one hundred twenty-four".