31403043421 has 16 divisors (see below), whose sum is σ = 33540825600. Its totient is φ = 29314545408.

The previous prime is 31403043403. The next prime is 31403043437. The reversal of 31403043421 is 12434030413.

It is a cyclic number.

It is not a de Polignac number, because 31403043421 - 2²⁹ = 30866172509 is a prime.

It is a super-2 number, since 2×31403043421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31403043461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1511220 + ... + 1531858.

It is an arithmetic number, because the mean of its divisors is an integer number (2096301600).

Almost surely, 2^31403043421 is an apocalyptic number.

It is an amenable number.

31403043421 is a deficient number, since it is larger than the sum of its proper divisors (2137782179).

31403043421 is a wasteful number, since it uses less digits than its factorization.

31403043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21828.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31403043421 its reverse (12434030413), we get a palindrome (43837073834).

The spelling of 31403043421 in words is "thirty-one billion, four hundred three million, forty-three thousand, four hundred twenty-one".