21002022011982 has 64 divisors (see below), whose sum is σ = 48252108810240. Its totient is φ = 6027063631200.

The previous prime is 21002022011977. The next prime is 21002022011987. The reversal of 21002022011982 is 28911022020012.

It is an interprime number because it is at equal distance from previous prime (21002022011977) and next prime (21002022011987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002022011987) 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, 310693 + ... + 6488495.

It is an arithmetic number, because the mean of its divisors is an integer number (753939200160).

Almost surely, 2^{21002022011982} is an apocalyptic number.

21002022011982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002022011982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24126054405120).

21002022011982 is an abundant number, since it is smaller than the sum of its proper divisors (27250086798258).

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

21002022011982 is a wasteful number, since it uses less digits than its factorization.

21002022011982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180549.

The product of its (nonzero) digits is 2304, while the sum is 30.

Adding to 21002022011982 its reverse (28911022020012), we get a palindrome (49913044031994).

The spelling of 21002022011982 in words is "twenty-one trillion, two billion, twenty-two million, eleven thousand, nine hundred eighty-two".