21002102002220 has 24 divisors (see below), whose sum is σ = 44106109731600. Its totient is φ = 8400517843392.

The previous prime is 21002102002163. The next prime is 21002102002309. The reversal of 21002102002220 is 2220020120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002102002195 and 21002102002204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19651250 + ... + 20692409.

It is an arithmetic number, because the mean of its divisors is an integer number (1837754572150).

Almost surely, 2^{21002102002220} is an apocalyptic number.

21002102002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002102002220 is an abundant number, since it is smaller than the sum of its proper divisors (23104007729380).

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

21002102002220 is a wasteful number, since it uses less digits than its factorization.

21002102002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40369697 (or 40369695 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002102002220 its reverse (2220020120012), we get a palindrome (23222122122232).

The spelling of 21002102002220 in words is "twenty-one trillion, two billion, one hundred two million, two thousand, two hundred twenty".