40519815021 has 12 divisors (see below), whose sum is σ = 66889853472. Its totient is φ = 23154179976.

The previous prime is 40519815019. The next prime is 40519815031. The reversal of 40519815021 is 12051891504.

40519815021 is a `hidden beast` number, since 40 + 519 + 81 + 5 + 0 + 21 = 666.

It is not a de Polignac number, because 40519815021 - 2¹ = 40519815019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40519815031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321585771 + ... + 321585896.

It is an arithmetic number, because the mean of its divisors is an integer number (5574154456).

Almost surely, 2^40519815021 is an apocalyptic number.

It is an amenable number.

40519815021 is a deficient number, since it is larger than the sum of its proper divisors (26370038451).

40519815021 is a wasteful number, since it uses less digits than its factorization.

40519815021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643171680 (or 643171677 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 40519815021 in words is "forty billion, five hundred nineteen million, eight hundred fifteen thousand, twenty-one".