1221101020122 has 16 divisors (see below), whose sum is σ = 2444096704320. Its totient is φ = 406717896032.

The previous prime is 1221101020099. The next prime is 1221101020127. The reversal of 1221101020122 is 2210201011221.

It is not an unprimeable number, because it can be changed into a prime (1221101020127) 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, 78935958 + ... + 78951425.

It is an arithmetic number, because the mean of its divisors is an integer number (152756044020).

Almost surely, 2^{1221101020122} is an apocalyptic number.

1221101020122 is an abundant number, since it is smaller than the sum of its proper divisors (1222995684198).

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

1221101020122 is a wasteful number, since it uses less digits than its factorization.

1221101020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157888677.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221101020122 its reverse (2210201011221), we get a palindrome (3431302031343).

The spelling of 1221101020122 in words is "one trillion, two hundred twenty-one billion, one hundred one million, twenty thousand, one hundred twenty-two".