2121587377636 has 12 divisors (see below), whose sum is σ = 3931176611628. Its totient is φ = 998394060032.

The previous prime is 2121587377627. The next prime is 2121587377639. The reversal of 2121587377636 is 6367737851212.

It can be written as a sum of positive squares in 2 ways, for example, as 1165385020900 + 956202356736 = 1079530^2 + 977856^2 .

It is a super-2 number, since 2×2121587377636² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121587377639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15599907121 + ... + 15599907256.

It is an arithmetic number, because the mean of its divisors is an integer number (327598050969).

Almost surely, 2^{2121587377636} is an apocalyptic number.

It is an amenable number.

2121587377636 is a deficient number, since it is larger than the sum of its proper divisors (1809589233992).

2121587377636 is a wasteful number, since it uses less digits than its factorization.

2121587377636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31199814398 (or 31199814396 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 58.

The spelling of 2121587377636 in words is "two trillion, one hundred twenty-one billion, five hundred eighty-seven million, three hundred seventy-seven thousand, six hundred thirty-six".