12101210121221 has 16 divisors (see below), whose sum is σ = 13070497680240. Its totient is φ = 11137427873280.

The previous prime is 12101210121199. The next prime is 12101210121223. The reversal of 12101210121221 is 12212101210121.

It can be written as a sum of positive squares in 8 ways, for example, as 1839208996 + 12099370912225 = 42886^2 + 3478415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12101210121221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12101210121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101210121223) 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, 17944811 + ... + 18606951.

It is an arithmetic number, because the mean of its divisors is an integer number (816906105015).

Almost surely, 2^{12101210121221} is an apocalyptic number.

It is an amenable number.

12101210121221 is a deficient number, since it is larger than the sum of its proper divisors (969287559019).

12101210121221 is a wasteful number, since it uses less digits than its factorization.

12101210121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666296.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12101210121221 its reverse (12212101210121), we get a palindrome (24313311331342).

The spelling of 12101210121221 in words is "twelve trillion, one hundred one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".