21201002012020 has 48 divisors (see below), whose sum is σ = 44614639440000. Its totient is φ = 8462777581440.

The previous prime is 21201002011957. The next prime is 21201002012087. The reversal of 21201002012020 is 2021020010212.

It is a happy number.

It is a congruent number.

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, 148321185 + ... + 148464055.

It is an arithmetic number, because the mean of its divisors is an integer number (929471655000).

Almost surely, 2^{21201002012020} is an apocalyptic number.

21201002012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201002012020 is an abundant number, since it is smaller than the sum of its proper divisors (23413637427980).

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

21201002012020 is a wasteful number, since it uses less digits than its factorization.

21201002012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158248 (or 158246 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21201002012020 its reverse (2021020010212), we get a palindrome (23222022022232).

The spelling of 21201002012020 in words is "twenty-one trillion, two hundred one billion, two million, twelve thousand, twenty".