21202110011220 has 192 divisors, whose sum is σ = 62783989954560. Its totient is φ = 5337346867200.

The previous prime is 21202110011183. The next prime is 21202110011321. The reversal of 21202110011220 is 2211001120212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21202110011220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 790726534 + ... + 790753346.

It is an arithmetic number, because the mean of its divisors is an integer number (326999947680).

Almost surely, 2^{21202110011220} is an apocalyptic number.

21202110011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202110011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31391994977280).

21202110011220 is an abundant number, since it is smaller than the sum of its proper divisors (41581879943340).

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

21202110011220 is a wasteful number, since it uses less digits than its factorization.

21202110011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37266 (or 37264 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21202110011220 its reverse (2211001120212), we get a palindrome (23413111131432).

The spelling of 21202110011220 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, eleven thousand, two hundred twenty".