21000210022020 has 24 divisors (see below), whose sum is σ = 58800588061824. Its totient is φ = 5600056005856.

The previous prime is 21000210022013. The next prime is 21000210022067. The reversal of 21000210022020 is 2022001200012.

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 = 21000210021987 and 21000210022005.

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, 175001750124 + ... + 175001750243.

It is an arithmetic number, because the mean of its divisors is an integer number (2450024502576).

Almost surely, 2^{21000210022020} is an apocalyptic number.

21000210022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000210022020 is an abundant number, since it is smaller than the sum of its proper divisors (37800378039804).

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

21000210022020 is a wasteful number, since it uses less digits than its factorization.

21000210022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350003500379 (or 350003500377 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21000210022020 its reverse (2022001200012), we get a palindrome (23022211222032).

The spelling of 21000210022020 in words is "twenty-one trillion, two hundred ten million, twenty-two thousand, twenty".