21102202102020 has 96 divisors (see below), whose sum is σ = 63688224407808. Its totient is φ = 5189737692672.

The previous prime is 21102202102001. The next prime is 21102202102057. The reversal of 21102202102020 is 2020120220112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11238904 + ... + 12981423.

It is an arithmetic number, because the mean of its divisors is an integer number (663419004248).

Almost surely, 2^{21102202102020} is an apocalyptic number.

21102202102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102202102020 is an abundant number, since it is smaller than the sum of its proper divisors (42586022305788).

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

21102202102020 is a wasteful number, since it uses less digits than its factorization.

21102202102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24221469 (or 24221467 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21102202102020 its reverse (2020120220112), we get a palindrome (23122322322132).

The spelling of 21102202102020 in words is "twenty-one trillion, one hundred two billion, two hundred two million, one hundred two thousand, twenty".