21202011011220 has 192 divisors, whose sum is σ = 68728926228480. Its totient is φ = 4839077140992.

The previous prime is 21202011011213. The next prime is 21202011011227. The reversal of 21202011011220 is 2211011020212.

It is an interprime number because it is at equal distance from previous prime (21202011011213) and next prime (21202011011227).

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 21202011011220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202011011227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14522982 + ... + 15916061.

It is an arithmetic number, because the mean of its divisors is an integer number (357963157440).

Almost surely, 2^{21202011011220} is an apocalyptic number.

21202011011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202011011220 is an abundant number, since it is smaller than the sum of its proper divisors (47526915217260).

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

21202011011220 is a wasteful number, since it uses less digits than its factorization.

21202011011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30439134 (or 30439132 counting only the distinct ones).

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

Adding to 21202011011220 its reverse (2211011020212), we get a palindrome (23413022031432).

The spelling of 21202011011220 in words is "twenty-one trillion, two hundred two billion, eleven million, eleven thousand, two hundred twenty".