21295977 has 8 divisors (see below), whose sum is σ = 29310720. Its totient is φ = 13739280.

The previous prime is 21295961. The next prime is 21295997. The reversal of 21295977 is 77959212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21295977 - 2⁴ = 21295961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21295997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114402 + ... + 114587.

It is an arithmetic number, because the mean of its divisors is an integer number (3663840).

Almost surely, 2^21295977 is an apocalyptic number.

It is an amenable number.

21295977 is a deficient number, since it is larger than the sum of its proper divisors (8014743).

21295977 is a wasteful number, since it uses less digits than its factorization.

21295977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229023.

The product of its digits is 79380, while the sum is 42.

The square root of 21295977 is about 4614.7564399435. The cubic root of 21295977 is about 277.1825311897.

The spelling of 21295977 in words is "twenty-one million, two hundred ninety-five thousand, nine hundred seventy-seven".