21121440654666 has 64 divisors (see below), whose sum is σ = 46381748224896. Its totient is φ = 6358972588800.

The previous prime is 21121440654649. The next prime is 21121440654709. The reversal of 21121440654666 is 66645604412112.

It is a super-2 number, since 2×21121440654666² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98674036 + ... + 98887856.

It is an arithmetic number, because the mean of its divisors is an integer number (724714816014).

Almost surely, 2^{21121440654666} is an apocalyptic number.

21121440654666 is an abundant number, since it is smaller than the sum of its proper divisors (25260307570230).

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

21121440654666 is a wasteful number, since it uses less digits than its factorization.

21121440654666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223527.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 21121440654666 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred forty million, six hundred fifty-four thousand, six hundred sixty-six".