221211012120 has 64 divisors (see below), whose sum is σ = 758437758720. Its totient is φ = 50562516864.

The previous prime is 221211012119. The next prime is 221211012157. The reversal of 221211012120 is 21210112122.

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 221211012120.

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, 131672382 + ... + 131674061.

It is an arithmetic number, because the mean of its divisors is an integer number (11850589980).

Almost surely, 2^221211012120 is an apocalyptic number.

221211012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211012120 is an abundant number, since it is smaller than the sum of its proper divisors (537226746600).

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

221211012120 is a wasteful number, since it uses less digits than its factorization.

221211012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263346464 (or 263346460 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221211012120 its reverse (21210112122), we get a palindrome (242421124242).

The spelling of 221211012120 in words is "two hundred twenty-one billion, two hundred eleven million, twelve thousand, one hundred twenty".