121202211221 has 16 divisors (see below), whose sum is σ = 149191018368. Its totient is φ = 95883998400.

The previous prime is 121202211203. The next prime is 121202211223. The reversal of 121202211221 is 122112202121.

It is a cyclic number.

It is not a de Polignac number, because 121202211221 - 2¹⁴ = 121202194837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121202211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202211223) 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, 667106 + ... + 829116.

It is an arithmetic number, because the mean of its divisors is an integer number (9324438648).

Almost surely, 2^121202211221 is an apocalyptic number.

It is an amenable number.

121202211221 is a deficient number, since it is larger than the sum of its proper divisors (27988807147).

121202211221 is a wasteful number, since it uses less digits than its factorization.

121202211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170252.

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

Adding to 121202211221 its reverse (122112202121), we get a palindrome (243314413342).

The spelling of 121202211221 in words is "one hundred twenty-one billion, two hundred two million, two hundred eleven thousand, two hundred twenty-one".