1221121021012 has 12 divisors (see below), whose sum is σ = 2137704065280. Its totient is φ = 610348430936.

The previous prime is 1221121021007. The next prime is 1221121021019. The reversal of 1221121021012 is 2101201211221.

It is a super-2 number, since 2×1221121021012² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221121021019) 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, 53006938 + ... + 53029969.

It is an arithmetic number, because the mean of its divisors is an integer number (178142005440).

Almost surely, 2^{1221121021012} is an apocalyptic number.

It is an amenable number.

1221121021012 is a deficient number, since it is larger than the sum of its proper divisors (916583044268).

1221121021012 is a wasteful number, since it uses less digits than its factorization.

1221121021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106039790 (or 106039788 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221121021012 its reverse (2101201211221), we get a palindrome (3322322232233).

The spelling of 1221121021012 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, twelve".