2121615056440 has 64 divisors (see below), whose sum is σ = 5207761784160. Its totient is φ = 771472504320.

The previous prime is 2121615056381. The next prime is 2121615056461. The reversal of 2121615056440 is 446505161212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121615056440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20757942 + ... + 20859898.

Almost surely, 2^{2121615056440} is an apocalyptic number.

2121615056440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121615056440 is an abundant number, since it is smaller than the sum of its proper divisors (3086146727720).

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

2121615056440 is a wasteful number, since it uses less digits than its factorization.

2121615056440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149272 (or 149268 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 2121615056440 in words is "two trillion, one hundred twenty-one billion, six hundred fifteen million, fifty-six thousand, four hundred forty".