21101202102020 has 24 divisors (see below), whose sum is σ = 44322076780800. Its totient is φ = 8438661342432.

The previous prime is 21101202102011. The next prime is 21101202102037. The reversal of 21101202102020 is 2020120210112.

It is a junction number, because it is equal to n+sod(n) for n = 21101202101986 and 21101202102004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113623550 + ... + 113809109.

It is an arithmetic number, because the mean of its divisors is an integer number (1846753199200).

Almost surely, 2^{21101202102020} is an apocalyptic number.

21101202102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101202102020 is an abundant number, since it is smaller than the sum of its proper divisors (23220874678780).

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

21101202102020 is a wasteful number, since it uses less digits than its factorization.

21101202102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227437307 (or 227437305 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21101202102020 its reverse (2020120210112), we get a palindrome (23121322312132).

The spelling of 21101202102020 in words is "twenty-one trillion, one hundred one billion, two hundred two million, one hundred two thousand, twenty".