211020122220 has 48 divisors (see below), whose sum is σ = 602004584160. Its totient is φ = 55210295296.

The previous prime is 211020122191. The next prime is 211020122263. The reversal of 211020122220 is 22221020112.

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 211020122220.

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, 33176085 + ... + 33182444.

It is an arithmetic number, because the mean of its divisors is an integer number (12541762170).

Almost surely, 2^211020122220 is an apocalyptic number.

211020122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211020122220 is an abundant number, since it is smaller than the sum of its proper divisors (390984461940).

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

211020122220 is a wasteful number, since it uses less digits than its factorization.

211020122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66358594 (or 66358592 counting only the distinct ones).

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

Adding to 211020122220 its reverse (22221020112), we get a palindrome (233241142332).

The spelling of 211020122220 in words is "two hundred eleven billion, twenty million, one hundred twenty-two thousand, two hundred twenty".