21177043707 has 16 divisors (see below), whose sum is σ = 28302032160. Its totient is φ = 14085073152.

The previous prime is 21177043703. The next prime is 21177043709. The reversal of 21177043707 is 70734077112.

It is not a de Polignac number, because 21177043707 - 2² = 21177043703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21177043703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4977193 + ... + 4981445.

It is an arithmetic number, because the mean of its divisors is an integer number (1768877010).

Almost surely, 2^21177043707 is an apocalyptic number.

21177043707 is a deficient number, since it is larger than the sum of its proper divisors (7124988453).

21177043707 is a wasteful number, since it uses less digits than its factorization.

21177043707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7742.

The product of its (nonzero) digits is 57624, while the sum is 39.

The spelling of 21177043707 in words is "twenty-one billion, one hundred seventy-seven million, forty-three thousand, seven hundred seven".