221312023201212 has 12 divisors (see below), whose sum is σ = 516394720802856. Its totient is φ = 73770674400400.

The previous prime is 221312023201163. The next prime is 221312023201219. The reversal of 221312023201212 is 212102320213122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×221312023201212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312023201219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9221334300039 + ... + 9221334300062.

It is an arithmetic number, because the mean of its divisors is an integer number (43032893400238).

Almost surely, 2^{221312023201212} is an apocalyptic number.

It is an amenable number.

221312023201212 is an abundant number, since it is smaller than the sum of its proper divisors (295082697601644).

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

221312023201212 is a wasteful number, since it uses less digits than its factorization.

221312023201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18442668600108 (or 18442668600106 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 221312023201212 its reverse (212102320213122), we get a palindrome (433414343414334).

The spelling of 221312023201212 in words is "two hundred twenty-one trillion, three hundred twelve billion, twenty-three million, two hundred one thousand, two hundred twelve".