1221002022101 has 4 divisors (see below), whose sum is σ = 1222384811232. Its totient is φ = 1219619232972.

The previous prime is 1221002022067. The next prime is 1221002022181. The reversal of 1221002022101 is 1012202001221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221002022101 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 (1221002022181) 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, 691393241 + ... + 691395006.

It is an arithmetic number, because the mean of its divisors is an integer number (305596202808).

Almost surely, 2^{1221002022101} is an apocalyptic number.

It is an amenable number.

1221002022101 is a deficient number, since it is larger than the sum of its proper divisors (1382789131).

1221002022101 is an equidigital number, since it uses as much as digits as its factorization.

1221002022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382789130.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221002022101 its reverse (1012202001221), we get a palindrome (2233204023322).

The spelling of 1221002022101 in words is "one trillion, two hundred twenty-one billion, two million, twenty-two thousand, one hundred one".