1221202202101 has 16 divisors (see below), whose sum is σ = 1477878445440. Its totient is φ = 985090752000.

The previous prime is 1221202202053. The next prime is 1221202202123. The reversal of 1221202202101 is 1012022021221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221202202101 - 2⁹ = 1221202201589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221202202161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058601 + ... + 1887601.

It is an arithmetic number, because the mean of its divisors is an integer number (92367402840).

Almost surely, 2^{1221202202101} is an apocalyptic number.

It is an amenable number.

1221202202101 is a deficient number, since it is larger than the sum of its proper divisors (256676243339).

1221202202101 is a wasteful number, since it uses less digits than its factorization.

1221202202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841404.

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

Adding to 1221202202101 its reverse (1012022021221), we get a palindrome (2233224223322).

The spelling of 1221202202101 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred two thousand, one hundred one".