21401210431 has 2 divisors, whose sum is σ = 21401210432. Its totient is φ = 21401210430.

The previous prime is 21401210399. The next prime is 21401210507. The reversal of 21401210431 is 13401210412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21401210431 - 2⁵ = 21401210399 is a prime.

It is a super-2 number, since 2×21401210431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21401210399 and 21401210408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21401210231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700605215 + 10700605216.

It is an arithmetic number, because the mean of its divisors is an integer number (10700605216).

Almost surely, 2^21401210431 is an apocalyptic number.

21401210431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401210431 is an equidigital number, since it uses as much as digits as its factorization.

21401210431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Subtracting from 21401210431 its sum of digits (19), we obtain a palindrome (21401210412).

Adding to 21401210431 its reverse (13401210412), we get a palindrome (34802420843).

The spelling of 21401210431 in words is "twenty-one billion, four hundred one million, two hundred ten thousand, four hundred thirty-one".