13212269981 has 2 divisors, whose sum is σ = 13212269982. Its totient is φ = 13212269980.

The previous prime is 13212269971. The next prime is 13212270017. The reversal of 13212269981 is 18996221231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7491768025 + 5720501956 = 86555^2 + 75634^2 .

It is a cyclic number.

It is not a de Polignac number, because 13212269981 - 2²² = 13208075677 is a prime.

It is a super-2 number, since 2×13212269981² (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 (13212269921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606134990 + 6606134991.

It is an arithmetic number, because the mean of its divisors is an integer number (6606134991).

Almost surely, 2^13212269981 is an apocalyptic number.

It is an amenable number.

13212269981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13212269981 is an equidigital number, since it uses as much as digits as its factorization.

13212269981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The spelling of 13212269981 in words is "thirteen billion, two hundred twelve million, two hundred sixty-nine thousand, nine hundred eighty-one".