21131692872767 has 2 divisors, whose sum is σ = 21131692872768. Its totient is φ = 21131692872766.

The previous prime is 21131692872671. The next prime is 21131692872803. The reversal of 21131692872767 is 76727829613112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21131692872767 - 2¹⁰ = 21131692871743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131692871767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565846436383 + 10565846436384.

It is an arithmetic number, because the mean of its divisors is an integer number (10565846436384).

Almost surely, 2^{21131692872767} is an apocalyptic number.

21131692872767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131692872767 is an equidigital number, since it uses as much as digits as its factorization.

21131692872767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 62.

The spelling of 21131692872767 in words is "twenty-one trillion, one hundred thirty-one billion, six hundred ninety-two million, eight hundred seventy-two thousand, seven hundred sixty-seven".