263372811421 has 2 divisors, whose sum is σ = 263372811422. Its totient is φ = 263372811420.

The previous prime is 263372811379. The next prime is 263372811473. The reversal of 263372811421 is 124118273362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262871544100 + 501267321 = 512710^2 + 22389^2 .

It is a cyclic number.

It is not a de Polignac number, because 263372811421 - 2¹⁵ = 263372778653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263372811521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131686405710 + 131686405711.

It is an arithmetic number, because the mean of its divisors is an integer number (131686405711).

Almost surely, 2^263372811421 is an apocalyptic number.

It is an amenable number.

263372811421 is a deficient number, since it is larger than the sum of its proper divisors (1).

263372811421 is an equidigital number, since it uses as much as digits as its factorization.

263372811421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The spelling of 263372811421 in words is "two hundred sixty-three billion, three hundred seventy-two million, eight hundred eleven thousand, four hundred twenty-one".