21481121645942 has 16 divisors (see below), whose sum is σ = 36825998400672. Its totient is φ = 9205890382080.

The previous prime is 21481121645899. The next prime is 21481121645957. The reversal of 21481121645942 is 24954612118412.

It is a super-2 number, since 2×21481121645942² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24945593 + ... + 25792340.

It is an arithmetic number, because the mean of its divisors is an integer number (2301624900042).

Almost surely, 2^{21481121645942} is an apocalyptic number.

21481121645942 is a deficient number, since it is larger than the sum of its proper divisors (15344876754730).

21481121645942 is a wasteful number, since it uses less digits than its factorization.

21481121645942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50768183.

The product of its digits is 1105920, while the sum is 50.

The spelling of 21481121645942 in words is "twenty-one trillion, four hundred eighty-one billion, one hundred twenty-one million, six hundred forty-five thousand, nine hundred forty-two".