22221221202012 has 24 divisors (see below), whose sum is σ = 59256589872256. Its totient is φ = 6348920343408.

The previous prime is 22221221201987. The next prime is 22221221202013. The reversal of 22221221202012 is 21020212212222.

It is a super-2 number, since 2×22221221202012² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 22221221202012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221221202013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132269173738 + ... + 132269173905.

Almost surely, 2^{22221221202012} is an apocalyptic number.

It is an amenable number.

22221221202012 is an abundant number, since it is smaller than the sum of its proper divisors (37035368670244).

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

22221221202012 is a wasteful number, since it uses less digits than its factorization.

22221221202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264538347657 (or 264538347655 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 22221221202012 its reverse (21020212212222), we get a palindrome (43241433414234).

The spelling of 22221221202012 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, twelve".