20021201001980 has 12 divisors (see below), whose sum is σ = 42044522104200. Its totient is φ = 8008480400784.

The previous prime is 20021201001979. The next prime is 20021201002027. The reversal of 20021201001980 is 8910010212002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500530025030 + ... + 500530025069.

It is an arithmetic number, because the mean of its divisors is an integer number (3503710175350).

Almost surely, 2^{20021201001980} is an apocalyptic number.

20021201001980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021201001980 is an abundant number, since it is smaller than the sum of its proper divisors (22023321102220).

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

20021201001980 is a wasteful number, since it uses less digits than its factorization.

20021201001980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001060050108 (or 1001060050106 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

Adding to 20021201001980 its reverse (8910010212002), we get a palindrome (28931211213982).

The spelling of 20021201001980 in words is "twenty trillion, twenty-one billion, two hundred one million, one thousand, nine hundred eighty".