21102110002020 has 24 divisors (see below), whose sum is σ = 59085908005824. Its totient is φ = 5627229333856.

The previous prime is 21102110002007. The next prime is 21102110002147. The reversal of 21102110002020 is 2020001120112.

It is a super-7 number, since 7×21102110002020⁷ (a number of 95 digits) contains 7777777 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21102110001987 and 21102110002005.

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, 175850916624 + ... + 175850916743.

It is an arithmetic number, because the mean of its divisors is an integer number (2461912833576).

Almost surely, 2^{21102110002020} is an apocalyptic number.

21102110002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102110002020 is an abundant number, since it is smaller than the sum of its proper divisors (37983798003804).

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

21102110002020 is a wasteful number, since it uses less digits than its factorization.

21102110002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351701833379 (or 351701833377 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21102110002020 its reverse (2020001120112), we get a palindrome (23122111122132).

The spelling of 21102110002020 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, two thousand, twenty".