21811546042 has 32 divisors (see below), whose sum is σ = 38455228224. Its totient is φ = 9147388800.

The previous prime is 21811546027. The next prime is 21811546067. The reversal of 21811546042 is 24064511812.

It is a junction number, because it is equal to n+sod(n) for n = 21811545989 and 21811546007.

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, 631542 + ... + 665182.

It is an arithmetic number, because the mean of its divisors is an integer number (1201725882).

Almost surely, 2^21811546042 is an apocalyptic number.

21811546042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21811546042 is a deficient number, since it is larger than the sum of its proper divisors (16643682182).

21811546042 is a wasteful number, since it uses less digits than its factorization.

21811546042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35934.

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 21811546042 in words is "twenty-one billion, eight hundred eleven million, five hundred forty-six thousand, forty-two".