20210211220 has 48 divisors (see below), whose sum is σ = 43518012048. Its totient is φ = 7880970240.

The previous prime is 20210211199. The next prime is 20210211233. The reversal of 20210211220 is 2211201202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 51322896 + 20158888324 = 7164^2 + 141982^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20210211220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105700 + ... + 227140.

It is an arithmetic number, because the mean of its divisors is an integer number (906625251).

Almost surely, 2^20210211220 is an apocalyptic number.

20210211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210211220 is an abundant number, since it is smaller than the sum of its proper divisors (23307800828).

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

20210211220 is a wasteful number, since it uses less digits than its factorization.

20210211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121660 (or 121658 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20210211220 its reverse (2211201202), we get a palindrome (22421412422).

The spelling of 20210211220 in words is "twenty billion, two hundred ten million, two hundred eleven thousand, two hundred twenty".