21165657040148 has 12 divisors (see below), whose sum is σ = 37067981633760. Its totient is φ = 10574805144792.

The previous prime is 21165657040133. The next prime is 21165657040181. The reversal of 21165657040148 is 84104075656112.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21165657040096 and 21165657040105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2005837886 + ... + 2005848437.

It is an arithmetic number, because the mean of its divisors is an integer number (3088998469480).

Almost surely, 2^{21165657040148} is an apocalyptic number.

It is an amenable number.

21165657040148 is a deficient number, since it is larger than the sum of its proper divisors (15902324593612).

21165657040148 is a wasteful number, since it uses less digits than its factorization.

21165657040148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011687646 (or 4011687644 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 21165657040148 in words is "twenty-one trillion, one hundred sixty-five billion, six hundred fifty-seven million, forty thousand, one hundred forty-eight".