13121001202221 has 12 divisors (see below), whose sum is σ = 20675517046080. Its totient is φ = 7952121940680.

The previous prime is 13121001202201. The next prime is 13121001202277. The reversal of 13121001202221 is 12220210012131.

13121001202221 is a `hidden beast` number, since 1 + 31 + 210 + 0 + 1 + 202 + 221 = 666.

It is not a de Polignac number, because 13121001202221 - 2⁶ = 13121001202157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13121001202194 and 13121001202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121001202201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66267682741 + ... + 66267682938.

It is an arithmetic number, because the mean of its divisors is an integer number (1722959753840).

Almost surely, 2^{13121001202221} is an apocalyptic number.

13121001202221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13121001202221 is a deficient number, since it is larger than the sum of its proper divisors (7554515843859).

13121001202221 is a wasteful number, since it uses less digits than its factorization.

13121001202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132535365696 (or 132535365693 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 13121001202221 its reverse (12220210012131), we get a palindrome (25341211214352).

The spelling of 13121001202221 in words is "thirteen trillion, one hundred twenty-one billion, one million, two hundred two thousand, two hundred twenty-one".