921386521426 has 32 divisors (see below), whose sum is σ = 1634064969600. Its totient is φ = 381434352000.

The previous prime is 921386521409. The next prime is 921386521457. The reversal of 921386521426 is 624125683129.

921386521426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 921386521426.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7888576 + ... + 8004523.

It is an arithmetic number, because the mean of its divisors is an integer number (51064530300).

Almost surely, 2^921386521426 is an apocalyptic number.

921386521426 is a deficient number, since it is larger than the sum of its proper divisors (712678448174).

921386521426 is a wasteful number, since it uses less digits than its factorization.

921386521426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15893250.

The product of its digits is 1244160, while the sum is 49.

The spelling of 921386521426 in words is "nine hundred twenty-one billion, three hundred eighty-six million, five hundred twenty-one thousand, four hundred twenty-six".