6921399290454 has 48 divisors (see below), whose sum is σ = 16359960721104. Its totient is φ = 2097356587200.

The previous prime is 6921399290453. The next prime is 6921399290483. The reversal of 6921399290454 is 4540929931296.

6921399290454 is a `hidden beast` number, since 6 + 9 + 2 + 1 + 3 + 9 + 92 + 90 + 454 = 666.

It is a super-2 number, since 2×6921399290454² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6921399290391 and 6921399290400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921399290453) 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, 12168432 + ... + 12724524.

It is an arithmetic number, because the mean of its divisors is an integer number (340832515023).

Almost surely, 2^{6921399290454} is an apocalyptic number.

6921399290454 is an abundant number, since it is smaller than the sum of its proper divisors (9438561430650).

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

6921399290454 is a wasteful number, since it uses less digits than its factorization.

6921399290454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618973 (or 618970 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 63.

The spelling of 6921399290454 in words is "six trillion, nine hundred twenty-one billion, three hundred ninety-nine million, two hundred ninety thousand, four hundred fifty-four".