20727131213 has 2 divisors, whose sum is σ = 20727131214. Its totient is φ = 20727131212.

The previous prime is 20727131167. The next prime is 20727131251. The reversal of 20727131213 is 31213172702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14327611204 + 6399520009 = 119698^2 + 79997^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727131213 - 2¹² = 20727127117 is a prime.

It is a super-2 number, since 2×20727131213² (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 (20727131263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363565606 + 10363565607.

It is an arithmetic number, because the mean of its divisors is an integer number (10363565607).

Almost surely, 2^20727131213 is an apocalyptic number.

It is an amenable number.

20727131213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727131213 is an equidigital number, since it uses as much as digits as its factorization.

20727131213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The spelling of 20727131213 in words is "twenty billion, seven hundred twenty-seven million, one hundred thirty-one thousand, two hundred thirteen".