921139231005 has 32 divisors (see below), whose sum is σ = 1871520979200. Its totient is φ = 421092219456.

The previous prime is 921139231003. The next prime is 921139231037. The reversal of 921139231005 is 500132931129.

It is not a de Polignac number, because 921139231005 - 2¹ = 921139231003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921139231003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487374310 + ... + 487376199.

It is an arithmetic number, because the mean of its divisors is an integer number (58485030600).

Almost surely, 2^921139231005 is an apocalyptic number.

It is an amenable number.

921139231005 is an abundant number, since it is smaller than the sum of its proper divisors (950381748195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921139231005 is a wasteful number, since it uses less digits than its factorization.

921139231005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974750530 (or 974750524 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The spelling of 921139231005 in words is "nine hundred twenty-one billion, one hundred thirty-nine million, two hundred thirty-one thousand, five".