21202102101020 has 24 divisors (see below), whose sum is σ = 46867804645200. Its totient is φ = 8034480796032.

The previous prime is 21202102101017. The next prime is 21202102101067. The reversal of 21202102101020 is 2010120120212.

It is a junction number, because it is equal to n+sod(n) for n = 21202102100986 and 21202102101004.

It is a congruent number.

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, 27897502385 + ... + 27897503144.

It is an arithmetic number, because the mean of its divisors is an integer number (1952825193550).

Almost surely, 2^{21202102101020} is an apocalyptic number.

21202102101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202102101020 is an abundant number, since it is smaller than the sum of its proper divisors (25665702544180).

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

21202102101020 is a wasteful number, since it uses less digits than its factorization.

21202102101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55795005557 (or 55795005555 counting only the distinct ones).

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

Adding to 21202102101020 its reverse (2010120120212), we get a palindrome (23212222221232).

The spelling of 21202102101020 in words is "twenty-one trillion, two hundred two billion, one hundred two million, one hundred one thousand, twenty".