21177702073 has 8 divisors (see below), whose sum is σ = 23188835520. Its totient is φ = 19180883280.

The previous prime is 21177702061. The next prime is 21177702083. The reversal of 21177702073 is 37020777112.

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

It is a cyclic number.

It is not a de Polignac number, because 21177702073 - 2²⁹ = 20640831161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21177702053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575565 + ... + 3581482.

It is an arithmetic number, because the mean of its divisors is an integer number (2898604440).

Almost surely, 2^21177702073 is an apocalyptic number.

It is an amenable number.

21177702073 is a deficient number, since it is larger than the sum of its proper divisors (2011133447).

21177702073 is a wasteful number, since it uses less digits than its factorization.

21177702073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7157327.

The product of its (nonzero) digits is 28812, while the sum is 37.

The spelling of 21177702073 in words is "twenty-one billion, one hundred seventy-seven million, seven hundred two thousand, seventy-three".