12210691901 has 2 divisors, whose sum is σ = 12210691902. Its totient is φ = 12210691900.

The previous prime is 12210691819. The next prime is 12210692029. The reversal of 12210691901 is 10919601221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12210471001 + 220900 = 110501^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210691901 - 2¹⁴ = 12210675517 is a prime.

It is a super-2 number, since 2×12210691901² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12210691501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105345950 + 6105345951.

It is an arithmetic number, because the mean of its divisors is an integer number (6105345951).

Almost surely, 2^12210691901 is an apocalyptic number.

It is an amenable number.

12210691901 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210691901 is an equidigital number, since it uses as much as digits as its factorization.

12210691901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 12210691901 in words is "twelve billion, two hundred ten million, six hundred ninety-one thousand, nine hundred one".