31423201421 has 4 divisors (see below), whose sum is σ = 33271625052. Its totient is φ = 29574777792.

The previous prime is 31423201399. The next prime is 31423201457. The reversal of 31423201421 is 12410232413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13130638921 + 18292562500 = 114589^2 + 135250^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423201421 - 2¹⁸ = 31422939277 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 (31423201921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924211790 + ... + 924211823.

It is an arithmetic number, because the mean of its divisors is an integer number (8317906263).

Almost surely, 2^31423201421 is an apocalyptic number.

It is an amenable number.

31423201421 is a deficient number, since it is larger than the sum of its proper divisors (1848423631).

31423201421 is a wasteful number, since it uses less digits than its factorization.

31423201421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848423630.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31423201421 its reverse (12410232413), we get a palindrome (43833433834).

The spelling of 31423201421 in words is "thirty-one billion, four hundred twenty-three million, two hundred one thousand, four hundred twenty-one".