921701971927 has 4 divisors (see below), whose sum is σ = 1005493060296. Its totient is φ = 837910883560.

The previous prime is 921701971921. The next prime is 921701971979. The reversal of 921701971927 is 729179107129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921701971927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921701971921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41895544168 + ... + 41895544189.

It is an arithmetic number, because the mean of its divisors is an integer number (251373265074).

Almost surely, 2^921701971927 is an apocalyptic number.

921701971927 is a deficient number, since it is larger than the sum of its proper divisors (83791088369).

921701971927 is a wasteful number, since it uses less digits than its factorization.

921701971927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83791088368.

The product of its (nonzero) digits is 1000188, while the sum is 55.

The spelling of 921701971927 in words is "nine hundred twenty-one billion, seven hundred one million, nine hundred seventy-one thousand, nine hundred twenty-seven".