921402420421 has 24 divisors (see below), whose sum is σ = 1081311577920. Its totient is φ = 782817944832.

The previous prime is 921402420347. The next prime is 921402420439. The reversal of 921402420421 is 124024204129.

It is not a de Polignac number, because 921402420421 - 2³¹ = 919254936773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921402420451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2729110 + ... + 3048088.

It is an arithmetic number, because the mean of its divisors is an integer number (45054649080).

Almost surely, 2^921402420421 is an apocalyptic number.

It is an amenable number.

921402420421 is a deficient number, since it is larger than the sum of its proper divisors (159909157499).

921402420421 is a wasteful number, since it uses less digits than its factorization.

921402420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319513 (or 319506 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 921402420421 in words is "nine hundred twenty-one billion, four hundred two million, four hundred twenty thousand, four hundred twenty-one".