21010212012020 has 144 divisors (see below), whose sum is σ = 57921570564480. Its totient is φ = 6322822329600.

The previous prime is 21010212011993. The next prime is 21010212012061. The reversal of 21010212012020 is 2021021201012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21010212011986 and 21010212012004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33290816 + ... + 33916055.

It is an arithmetic number, because the mean of its divisors is an integer number (402233128920).

Almost surely, 2^{21010212012020} is an apocalyptic number.

21010212012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010212012020 is an abundant number, since it is smaller than the sum of its proper divisors (36911358552460).

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

21010212012020 is a wasteful number, since it uses less digits than its factorization.

21010212012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67206934 (or 67206925 counting only the distinct ones).

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

Adding to 21010212012020 its reverse (2021021201012), we get a palindrome (23031233213032).

The spelling of 21010212012020 in words is "twenty-one trillion, ten billion, two hundred twelve million, twelve thousand, twenty".