31423430421 has 24 divisors (see below), whose sum is σ = 47798054720. Its totient is φ = 19838177856.

The previous prime is 31423430419. The next prime is 31423430449. The reversal of 31423430421 is 12403432413.

31423430421 is a `hidden beast` number, since 3 + 1 + 4 + 234 + 3 + 0 + 421 = 666.

It is not a de Polignac number, because 31423430421 - 2¹ = 31423430419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423430471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391305 + ... + 464721.

Almost surely, 2^31423430421 is an apocalyptic number.

It is an amenable number.

31423430421 is a deficient number, since it is larger than the sum of its proper divisors (16374624299).

31423430421 is a wasteful number, since it uses less digits than its factorization.

31423430421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75945 (or 75942 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31423430421 its reverse (12403432413), we get a palindrome (43826862834).

The spelling of 31423430421 in words is "thirty-one billion, four hundred twenty-three million, four hundred thirty thousand, four hundred twenty-one".