21102002111020 has 48 divisors (see below), whose sum is σ = 45490571013888. Its totient is φ = 8217993389760.

The previous prime is 21102002110963. The next prime is 21102002111081. The reversal of 21102002111020 is 2011120020112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39181434 + ... + 39716353.

It is an arithmetic number, because the mean of its divisors is an integer number (947720229456).

Almost surely, 2^{21102002111020} is an apocalyptic number.

21102002111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102002111020 is an abundant number, since it is smaller than the sum of its proper divisors (24388568902868).

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

21102002111020 is a wasteful number, since it uses less digits than its factorization.

21102002111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78898150 (or 78898148 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102002111020 its reverse (2011120020112), we get a palindrome (23113122131132).

The spelling of 21102002111020 in words is "twenty-one trillion, one hundred two billion, two million, one hundred eleven thousand, twenty".