21202210101220 has 24 divisors (see below), whose sum is σ = 44562664012608. Its totient is φ = 8473641602400.

The previous prime is 21202210101203. The next prime is 21202210101251. The reversal of 21202210101220 is 2210101220212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21202210101194 and 21202210101203.

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, 452628376 + ... + 452675215.

It is an arithmetic number, because the mean of its divisors is an integer number (1856777667192).

Almost surely, 2^{21202210101220} is an apocalyptic number.

21202210101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202210101220 is an abundant number, since it is smaller than the sum of its proper divisors (23360453911388).

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

21202210101220 is a wasteful number, since it uses less digits than its factorization.

21202210101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905304771 (or 905304769 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202210101220 its reverse (2210101220212), we get a palindrome (23412311321432).

The spelling of 21202210101220 in words is "twenty-one trillion, two hundred two billion, two hundred ten million, one hundred one thousand, two hundred twenty".