2121020021970 has 80 divisors (see below), whose sum is σ = 5753658101400. Its totient is φ = 560599958016.

The previous prime is 2121020021969. The next prime is 2121020021977. The reversal of 2121020021970 is 791200201212.

It can be written as a sum of positive squares in 4 ways, for example, as 392365684881 + 1728654337089 = 626391^2 + 1314783^2 .

It is a super-3 number, since 3×2121020021970³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2121020021977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11494945 + ... + 11678004.

Almost surely, 2^{2121020021970} is an apocalyptic number.

2121020021970 is an abundant number, since it is smaller than the sum of its proper divisors (3632638079430).

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

2121020021970 is a wasteful number, since it uses less digits than its factorization.

2121020021970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23173081 (or 23173072 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The spelling of 2121020021970 in words is "two trillion, one hundred twenty-one billion, twenty million, twenty-one thousand, nine hundred seventy".