21000202201020 has 96 divisors (see below), whose sum is σ = 69016880798208. Its totient is φ = 4670315235072.

The previous prime is 21000202201001. The next prime is 21000202201031. The reversal of 21000202201020 is 2010220200012.

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 = 21000202200987 and 21000202201005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 675666642 + ... + 675697721.

It is an arithmetic number, because the mean of its divisors is an integer number (718925841648).

Almost surely, 2^{21000202201020} is an apocalyptic number.

21000202201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000202201020 is an abundant number, since it is smaller than the sum of its proper divisors (48016678597188).

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

21000202201020 is a wasteful number, since it uses less digits than its factorization.

21000202201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351364419 (or 1351364417 counting only the distinct ones).

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

Adding to 21000202201020 its reverse (2010220200012), we get a palindrome (23010422401032).

The spelling of 21000202201020 in words is "twenty-one trillion, two hundred two million, two hundred one thousand, twenty".