221111212101012 has 18 divisors (see below), whose sum is σ = 558920008366538. Its totient is φ = 73703737366992.

The previous prime is 221111212101007. The next prime is 221111212101019. The reversal of 221111212101012 is 210101212111122.

It is a happy number.

221111212101012 is a `hidden beast` number, since 221 + 11 + 121 + 210 + 101 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 214711698465936 + 6399513635076 = 14653044^2 + 2529726^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 (221111212101019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3070989056923 + ... + 3070989056994.

Almost surely, 2^{221111212101012} is an apocalyptic number.

It is an amenable number.

221111212101012 is an abundant number, since it is smaller than the sum of its proper divisors (337808796265526).

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

221111212101012 is a wasteful number, since it uses less digits than its factorization.

221111212101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6141978113927 (or 6141978113922 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221111212101012 its reverse (210101212111122), we get a palindrome (431212424212134).

The spelling of 221111212101012 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, one hundred one thousand, twelve".