263470372021 has 2 divisors, whose sum is σ = 263470372022. Its totient is φ = 263470372020.

The previous prime is 263470372019. The next prime is 263470372063. The reversal of 263470372021 is 120273074362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262872569521 + 597802500 = 512711^2 + 24450^2 .

It is a cyclic number.

It is not a de Polignac number, because 263470372021 - 2¹ = 263470372019 is a prime.

Together with 263470372019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263470372721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131735186010 + 131735186011.

It is an arithmetic number, because the mean of its divisors is an integer number (131735186011).

Almost surely, 2^263470372021 is an apocalyptic number.

It is an amenable number.

263470372021 is a deficient number, since it is larger than the sum of its proper divisors (1).

263470372021 is an equidigital number, since it uses as much as digits as its factorization.

263470372021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 37.

The spelling of 263470372021 in words is "two hundred sixty-three billion, four hundred seventy million, three hundred seventy-two thousand, twenty-one".