1102201212221 has 4 divisors (see below), whose sum is σ = 1102369416732. Its totient is φ = 1102033007712.

The previous prime is 1102201212209. The next prime is 1102201212269. The reversal of 1102201212221 is 1222121022011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122871280900 + 979329931321 = 350530^2 + 989611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1102201212221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1102201212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102201212271) 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, 84092426 + ... + 84105531.

It is an arithmetic number, because the mean of its divisors is an integer number (275592354183).

Almost surely, 2^{1102201212221} is an apocalyptic number.

It is an amenable number.

1102201212221 is a deficient number, since it is larger than the sum of its proper divisors (168204511).

1102201212221 is an equidigital number, since it uses as much as digits as its factorization.

1102201212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168204510.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1102201212221 its reverse (1222121022011), we get a palindrome (2324322234232).

The spelling of 1102201212221 in words is "one trillion, one hundred two billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".