1221222001012 has 12 divisors (see below), whose sum is σ = 2301533771236. Its totient is φ = 563640923520.

The previous prime is 1221222000961. The next prime is 1221222001033. The reversal of 1221222001012 is 2101002221221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 124104016656 + 1097117984356 = 352284^2 + 1047434^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11742519189 + ... + 11742519292.

Almost surely, 2^{1221222001012} is an apocalyptic number.

It is an amenable number.

1221222001012 is a deficient number, since it is larger than the sum of its proper divisors (1080311770224).

1221222001012 is a wasteful number, since it uses less digits than its factorization.

1221222001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23485038498 (or 23485038496 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221222001012 its reverse (2101002221221), we get a palindrome (3322224222233).

The spelling of 1221222001012 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one thousand, twelve".