2121640236432 has 80 divisors (see below), whose sum is σ = 6099306583680. Its totient is φ = 706120253568.

The previous prime is 2121640236431. The next prime is 2121640236451. The reversal of 2121640236432 is 2346320461212.

2121640236432 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 6 + 4 + 0 + 2 + 3 + 643 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2121640236431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3515863 + ... + 4074870.

It is an arithmetic number, because the mean of its divisors is an integer number (76241332296).

Almost surely, 2^{2121640236432} is an apocalyptic number.

It is an amenable number.

2121640236432 is an abundant number, since it is smaller than the sum of its proper divisors (3977666347248).

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

2121640236432 is a wasteful number, since it uses less digits than its factorization.

2121640236432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7591397 (or 7591385 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 2121640236432 its reverse (2346320461212), we get a palindrome (4467960697644).

The spelling of 2121640236432 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, two hundred thirty-six thousand, four hundred thirty-two".