2121987959366 has 16 divisors (see below), whose sum is σ = 3475509282000. Its totient is φ = 963660718080.

The previous prime is 2121987959341. The next prime is 2121987959383. The reversal of 2121987959366 is 6639597891212.

It is a junction number, because it is equal to n+sod(n) for n = 2121987959296 and 2121987959305.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43938491 + ... + 43986758.

It is an arithmetic number, because the mean of its divisors is an integer number (217219330125).

Almost surely, 2^{2121987959366} is an apocalyptic number.

2121987959366 is a deficient number, since it is larger than the sum of its proper divisors (1353521322634).

2121987959366 is a wasteful number, since it uses less digits than its factorization.

2121987959366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87926359.

The product of its digits is 88179840, while the sum is 68.

The spelling of 2121987959366 in words is "two trillion, one hundred twenty-one billion, nine hundred eighty-seven million, nine hundred fifty-nine thousand, three hundred sixty-six".