21295894854 has 32 divisors (see below), whose sum is σ = 45904158720. Its totient is φ = 6547429152.

The previous prime is 21295894817. The next prime is 21295894877. The reversal of 21295894854 is 45849859212.

It is a junction number, because it is equal to n+sod(n) for n = 21295894794 and 21295894803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6972 + ... + 206495.

It is an arithmetic number, because the mean of its divisors is an integer number (1434504960).

Almost surely, 2^21295894854 is an apocalyptic number.

21295894854 is an abundant number, since it is smaller than the sum of its proper divisors (24608263866).

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

21295894854 is a wasteful number, since it uses less digits than its factorization.

21295894854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214764.

The product of its digits is 8294400, while the sum is 57.

The spelling of 21295894854 in words is "twenty-one billion, two hundred ninety-five million, eight hundred ninety-four thousand, eight hundred fifty-four".