21430031351 has 2 divisors, whose sum is σ = 21430031352. Its totient is φ = 21430031350.

The previous prime is 21430031267. The next prime is 21430031387. The reversal of 21430031351 is 15313003412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21430031351 - 2²⁶ = 21362922487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430037351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715015675 + 10715015676.

It is an arithmetic number, because the mean of its divisors is an integer number (10715015676).

Almost surely, 2^21430031351 is an apocalyptic number.

21430031351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430031351 is an equidigital number, since it uses as much as digits as its factorization.

21430031351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21430031351 its reverse (15313003412), we get a palindrome (36743034763).

The spelling of 21430031351 in words is "twenty-one billion, four hundred thirty million, thirty-one thousand, three hundred fifty-one".