2121020021968 has 20 divisors (see below), whose sum is σ = 4158988057728. Its totient is φ = 1047732781280.

The previous prime is 2121020021947. The next prime is 2121020021969. The reversal of 2121020021968 is 8691200201212.

It is a super-3 number, since 3×2121020021968³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020021969) 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, 798575488 + ... + 798578143.

Almost surely, 2^{2121020021968} is an apocalyptic number.

It is an amenable number.

2121020021968 is a deficient number, since it is larger than the sum of its proper divisors (2037968035760).

2121020021968 is a wasteful number, since it uses less digits than its factorization.

2121020021968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597153722 (or 1597153716 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 2121020021968 in words is "two trillion, one hundred twenty-one billion, twenty million, twenty-one thousand, nine hundred sixty-eight".