402381818899921 has 32 divisors (see below), whose sum is σ = 486879959973888. Its totient is φ = 325269360443520.

The previous prime is 402381818899909. The next prime is 402381818899937. The reversal of 402381818899921 is 129998818183204.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402381818899921 is a prime.

It is a super-2 number, since 2×402381818899921² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402381818899121) 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, 82286865 + ... + 87039598.

It is an arithmetic number, because the mean of its divisors is an integer number (15214998749184).

Almost surely, 2^{402381818899921} is an apocalyptic number.

It is an amenable number.

402381818899921 is a deficient number, since it is larger than the sum of its proper divisors (84498141073967).

402381818899921 is a wasteful number, since it uses less digits than its factorization.

402381818899921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169326781.

The product of its (nonzero) digits is 143327232, while the sum is 73.

The spelling of 402381818899921 in words is "four hundred two trillion, three hundred eighty-one billion, eight hundred eighteen million, eight hundred ninety-nine thousand, nine hundred twenty-one".