21113001431 has 2 divisors, whose sum is σ = 21113001432. Its totient is φ = 21113001430.

The previous prime is 21113001389. The next prime is 21113001461. The reversal of 21113001431 is 13410031112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113001431 - 2¹⁸ = 21112739287 is a prime.

It is a super-2 number, since 2×21113001431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113001461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556500715 + 10556500716.

It is an arithmetic number, because the mean of its divisors is an integer number (10556500716).

Almost surely, 2^21113001431 is an apocalyptic number.

21113001431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113001431 is an equidigital number, since it uses as much as digits as its factorization.

21113001431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21113001431 its reverse (13410031112), we get a palindrome (34523032543).

The spelling of 21113001431 in words is "twenty-one billion, one hundred thirteen million, one thousand, four hundred thirty-one".