21211222020220 has 48 divisors (see below), whose sum is σ = 44575243876800. Its totient is φ = 8478456250880.

The previous prime is 21211222020199. The next prime is 21211222020227. The reversal of 21211222020220 is 2202022211212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222020227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306525825 + ... + 306595015.

It is an arithmetic number, because the mean of its divisors is an integer number (928650914100).

Almost surely, 2^{21211222020220} is an apocalyptic number.

21211222020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211222020220 is an abundant number, since it is smaller than the sum of its proper divisors (23364021856580).

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

21211222020220 is a wasteful number, since it uses less digits than its factorization.

21211222020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79878 (or 79876 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21211222020220 its reverse (2202022211212), we get a palindrome (23413244231432).

The spelling of 21211222020220 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, twenty thousand, two hundred twenty".