2121360012556 has 24 divisors (see below), whose sum is σ = 3764845647360. Its totient is φ = 1045691245200.

The previous prime is 2121360012533. The next prime is 2121360012593. The reversal of 2121360012556 is 6552100631212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6227215 + ... + 6559033.

It is an arithmetic number, because the mean of its divisors is an integer number (156868568640).

Almost surely, 2^{2121360012556} is an apocalyptic number.

It is an amenable number.

2121360012556 is a deficient number, since it is larger than the sum of its proper divisors (1643485634804).

2121360012556 is a wasteful number, since it uses less digits than its factorization.

2121360012556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354405 (or 354403 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 2121360012556 its reverse (6552100631212), we get a palindrome (8673460643768).

The spelling of 2121360012556 in words is "two trillion, one hundred twenty-one billion, three hundred sixty million, twelve thousand, five hundred fifty-six".