21202012010220 has 96 divisors (see below), whose sum is σ = 61976495734272. Its totient is φ = 5405452428288.

The previous prime is 21202012010219. The next prime is 21202012010227. The reversal of 21202012010220 is 2201021020212.

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 21202012010220.

It is not an unprimeable number, because it can be changed into a prime (21202012010227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 813357 + ... + 6562436.

It is an arithmetic number, because the mean of its divisors is an integer number (645588497232).

Almost surely, 2^{21202012010220} is an apocalyptic number.

21202012010220 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 21202012010220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30988247867136).

21202012010220 is an abundant number, since it is smaller than the sum of its proper divisors (40774483724052).

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

21202012010220 is a wasteful number, since it uses less digits than its factorization.

21202012010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7377911 (or 7377909 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21202012010220 its reverse (2201021020212), we get a palindrome (23403033030432).

The spelling of 21202012010220 in words is "twenty-one trillion, two hundred two billion, twelve million, ten thousand, two hundred twenty".