211121020021980 has 96 divisors (see below), whose sum is σ = 610235932981248. Its totient is φ = 54480336595200.

The previous prime is 211121020021979. The next prime is 211121020021981. The reversal of 211121020021980 is 89120020121112.

It is an interprime number because it is at equal distance from previous prime (211121020021979) and next prime (211121020021981).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121020021981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37986219 + ... + 43187901.

It is an arithmetic number, because the mean of its divisors is an integer number (6356624301888).

Almost surely, 2^{211121020021980} is an apocalyptic number.

211121020021980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211121020021980 is an abundant number, since it is smaller than the sum of its proper divisors (399114912959268).

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

211121020021980 is a wasteful number, since it uses less digits than its factorization.

211121020021980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5223547 (or 5223545 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The spelling of 211121020021980 in words is "two hundred eleven trillion, one hundred twenty-one billion, twenty million, twenty-one thousand, nine hundred eighty".