21202012012220 has 72 divisors (see below), whose sum is σ = 48236008597056. Its totient is φ = 7824637946112.

The previous prime is 21202012012201. The next prime is 21202012012243. The reversal of 21202012012220 is 2221021020212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5452634 + ... + 8493246.

It is an arithmetic number, because the mean of its divisors is an integer number (669944563848).

Almost surely, 2^{21202012012220} is an apocalyptic number.

21202012012220 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 21202012012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24118004298528).

21202012012220 is an abundant number, since it is smaller than the sum of its proper divisors (27033996584836).

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

21202012012220 is a wasteful number, since it uses less digits than its factorization.

21202012012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042711 (or 3042696 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202012012220 its reverse (2221021020212), we get a palindrome (23423033032432).

The spelling of 21202012012220 in words is "twenty-one trillion, two hundred two billion, twelve million, twelve thousand, two hundred twenty".