40121621565051 has 32 divisors (see below), whose sum is σ = 58495752958720. Its totient is φ = 24313628248704.

The previous prime is 40121621565037. The next prime is 40121621565139. The reversal of 40121621565051 is 15056512612104.

It is a de Polignac number, because none of the positive numbers 2^k-40121621565051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40121621565001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28258501 + ... + 29644326.

It is an arithmetic number, because the mean of its divisors is an integer number (1827992279960).

Almost surely, 2^{40121621565051} is an apocalyptic number.

40121621565051 is a deficient number, since it is larger than the sum of its proper divisors (18374131393669).

40121621565051 is a wasteful number, since it uses less digits than its factorization.

40121621565051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57903115.

The product of its (nonzero) digits is 72000, while the sum is 39.

The spelling of 40121621565051 in words is "forty trillion, one hundred twenty-one billion, six hundred twenty-one million, five hundred sixty-five thousand, fifty-one".