221001012221112 has 64 divisors (see below), whose sum is σ = 614330508960000. Its totient is φ = 73614347072352.

The previous prime is 221001012221111. The next prime is 221001012221161. The reversal of 221001012221112 is 211122210100122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001012221111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365370738 + ... + 365975105.

It is an arithmetic number, because the mean of its divisors is an integer number (9598914202500).

Almost surely, 2^{221001012221112} is an apocalyptic number.

It is an amenable number.

221001012221112 is an abundant number, since it is smaller than the sum of its proper divisors (393329496738888).

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

221001012221112 is a wasteful number, since it uses less digits than its factorization.

221001012221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731347257 (or 731347247 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221001012221112 its reverse (211122210100122), we get a palindrome (432123222321234).

The spelling of 221001012221112 in words is "two hundred twenty-one trillion, one billion, twelve million, two hundred twenty-one thousand, one hundred twelve".