1221002221012 has 24 divisors (see below), whose sum is σ = 2452668229760. Its totient is φ = 521001568800.

The previous prime is 1221002220947. The next prime is 1221002221013. The reversal of 1221002221012 is 2101222001221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002221013) 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, 95205864 + ... + 95218687.

Almost surely, 2^{1221002221012} is an apocalyptic number.

It is an amenable number.

1221002221012 is an abundant number, since it is smaller than the sum of its proper divisors (1231666008748).

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

1221002221012 is a wasteful number, since it uses less digits than its factorization.

1221002221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190424791 (or 190424789 counting only the distinct ones).

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

Adding to 1221002221012 its reverse (2101222001221), we get a palindrome (3322224222233).

The spelling of 1221002221012 in words is "one trillion, two hundred twenty-one billion, two million, two hundred twenty-one thousand, twelve".