921959255387 has 4 divisors (see below), whose sum is σ = 944446066536. Its totient is φ = 899472444240.

The previous prime is 921959255377. The next prime is 921959255417. The reversal of 921959255387 is 783552959129.

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

It is a cyclic number.

It is not a de Polignac number, because 921959255387 - 2⁸ = 921959255131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921959255317) 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, 11243405513 + ... + 11243405594.

It is an arithmetic number, because the mean of its divisors is an integer number (236111516634).

Almost surely, 2^921959255387 is an apocalyptic number.

921959255387 is a deficient number, since it is larger than the sum of its proper divisors (22486811149).

921959255387 is a wasteful number, since it uses less digits than its factorization.

921959255387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22486811148.

The product of its digits is 61236000, while the sum is 65.

The spelling of 921959255387 in words is "nine hundred twenty-one billion, nine hundred fifty-nine million, two hundred fifty-five thousand, three hundred eighty-seven".