221001211122012 has 60 divisors (see below), whose sum is σ = 577900288261296. Its totient is φ = 73646736814080.

The previous prime is 221001211122011. The next prime is 221001211122017. The reversal of 221001211122012 is 210221112100122.

221001211122012 is a `hidden beast` number, since 221 + 0 + 0 + 1 + 211 + 1 + 220 + 12 = 666.

It is a super-2 number, since 2×221001211122012² (a number of 29 digits) contains 22 as substring.

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 (221001211122011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 92961189 + ... + 95308892.

Almost surely, 2^{221001211122012} is an apocalyptic number.

It is an amenable number.

221001211122012 is an abundant number, since it is smaller than the sum of its proper divisors (356899077139284).

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

221001211122012 is a wasteful number, since it uses less digits than its factorization.

221001211122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188273720 (or 188273709 counting only the distinct ones).

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

Adding to 221001211122012 its reverse (210221112100122), we get a palindrome (431222323222134).

The spelling of 221001211122012 in words is "two hundred twenty-one trillion, one billion, two hundred eleven million, one hundred twenty-two thousand, twelve".