21000102010220 has 12 divisors (see below), whose sum is σ = 44100214221504. Its totient is φ = 8400040804080.

The previous prime is 21000102010211. The next prime is 21000102010291. The reversal of 21000102010220 is 2201020100012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525002550236 + ... + 525002550275.

It is an arithmetic number, because the mean of its divisors is an integer number (3675017851792).

Almost surely, 2^{21000102010220} is an apocalyptic number.

21000102010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000102010220 is an abundant number, since it is smaller than the sum of its proper divisors (23100112211284).

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

21000102010220 is a wasteful number, since it uses less digits than its factorization.

21000102010220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050005100520 (or 1050005100518 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21000102010220 its reverse (2201020100012), we get a palindrome (23201122110232).

The spelling of 21000102010220 in words is "twenty-one trillion, one hundred two million, ten thousand, two hundred twenty".