21293591351 has 2 divisors, whose sum is σ = 21293591352. Its totient is φ = 21293591350.

The previous prime is 21293591299. The next prime is 21293591381. The reversal of 21293591351 is 15319539212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21293591351 - 2²² = 21289397047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21293591299 and 21293591308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21293591381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646795675 + 10646795676.

It is an arithmetic number, because the mean of its divisors is an integer number (10646795676).

Almost surely, 2^21293591351 is an apocalyptic number.

21293591351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21293591351 is an equidigital number, since it uses as much as digits as its factorization.

21293591351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The spelling of 21293591351 in words is "twenty-one billion, two hundred ninety-three million, five hundred ninety-one thousand, three hundred fifty-one".