1980021936942 has 72 divisors (see below), whose sum is σ = 4995296791056. Its totient is φ = 565172645184.

The previous prime is 1980021936901. The next prime is 1980021936979. The reversal of 1980021936942 is 2496391200891.

It is a super-2 number, since 2×1980021936942² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 175498 + ... + 1997709.

It is an arithmetic number, because the mean of its divisors is an integer number (69379122098).

Almost surely, 2^{1980021936942} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980021936942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2497648395528).

1980021936942 is an abundant number, since it is smaller than the sum of its proper divisors (3015274854114).

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

1980021936942 is a wasteful number, since it uses less digits than its factorization.

1980021936942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174262 (or 2174252 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 1980021936942 in words is "one trillion, nine hundred eighty billion, twenty-one million, nine hundred thirty-six thousand, nine hundred forty-two".