12100221021221 has 32 divisors (see below), whose sum is σ = 13285907980800. Its totient is φ = 10981189440000.

The previous prime is 12100221021209. The next prime is 12100221021233. The reversal of 12100221021221 is 12212012200121.

It is an interprime number because it is at equal distance from previous prime (12100221021209) and next prime (12100221021233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12100221021221 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 12100221021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100221051221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10595771 + ... + 11682071.

It is an arithmetic number, because the mean of its divisors is an integer number (415184624400).

Almost surely, 2^{12100221021221} is an apocalyptic number.

It is an amenable number.

12100221021221 is a deficient number, since it is larger than the sum of its proper divisors (1185686959579).

12100221021221 is a wasteful number, since it uses less digits than its factorization.

12100221021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086621.

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

Adding to 12100221021221 its reverse (12212012200121), we get a palindrome (24312233221342).

The spelling of 12100221021221 in words is "twelve trillion, one hundred billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".