13921925526221 has 2 divisors, whose sum is σ = 13921925526222. Its totient is φ = 13921925526220.

The previous prime is 13921925526199. The next prime is 13921925526233. The reversal of 13921925526221 is 12262552912931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13522645609225 + 399279916996 = 3677315^2 + 631886^2 .

It is a cyclic number.

It is not a de Polignac number, because 13921925526221 - 2¹⁰ = 13921925525197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13921925526221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13921925526241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6960962763110 + 6960962763111.

It is an arithmetic number, because the mean of its divisors is an integer number (6960962763111).

Almost surely, 2^{13921925526221} is an apocalyptic number.

It is an amenable number.

13921925526221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921925526221 is an equidigital number, since it uses as much as digits as its factorization.

13921925526221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 50.

The spelling of 13921925526221 in words is "thirteen trillion, nine hundred twenty-one billion, nine hundred twenty-five million, five hundred twenty-six thousand, two hundred twenty-one".