1221202222101 has 24 divisors (see below), whose sum is σ = 1840984644096. Its totient is φ = 778597179360.

The previous prime is 1221202222069. The next prime is 1221202222129. The reversal of 1221202222101 is 1012222021221.

It is a happy number.

It is not a de Polignac number, because 1221202222101 - 2⁵ = 1221202222069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221202222301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 624316 + ... + 1682906.

It is an arithmetic number, because the mean of its divisors is an integer number (76707693504).

Almost surely, 2^{1221202222101} is an apocalyptic number.

It is an amenable number.

1221202222101 is a deficient number, since it is larger than the sum of its proper divisors (619782421995).

1221202222101 is a wasteful number, since it uses less digits than its factorization.

1221202222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064193 (or 1064190 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221202222101 its reverse (1012222021221), we get a palindrome (2233424243322).

The spelling of 1221202222101 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred twenty-two thousand, one hundred one".