21121001982 has 48 divisors (see below), whose sum is σ = 47780197920. Its totient is φ = 6730232256.

The previous prime is 21121001969. The next prime is 21121002029. The reversal of 21121001982 is 28910012112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 726388 + ... + 754904.

It is an arithmetic number, because the mean of its divisors is an integer number (995420790).

Almost surely, 2^21121001982 is an apocalyptic number.

21121001982 is an abundant number, since it is smaller than the sum of its proper divisors (26659195938).

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

21121001982 is a wasteful number, since it uses less digits than its factorization.

21121001982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30337 (or 30334 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 21121001982 in words is "twenty-one billion, one hundred twenty-one million, one thousand, nine hundred eighty-two".