12205721131 has 2 divisors, whose sum is σ = 12205721132. Its totient is φ = 12205721130.

The previous prime is 12205721119. The next prime is 12205721159. The reversal of 12205721131 is 13112750221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12205721131 is a prime.

It is a super-2 number, since 2×12205721131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12205721096 and 12205721105.

It is not a weakly prime, because it can be changed into another prime (12205721531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6102860565 + 6102860566.

It is an arithmetic number, because the mean of its divisors is an integer number (6102860566).

Almost surely, 2^12205721131 is an apocalyptic number.

12205721131 is a deficient number, since it is larger than the sum of its proper divisors (1).

12205721131 is an equidigital number, since it uses as much as digits as its factorization.

12205721131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 12205721131 in words is "twelve billion, two hundred five million, seven hundred twenty-one thousand, one hundred thirty-one".