31144123421 has 4 divisors (see below), whose sum is σ = 31608961152. Its totient is φ = 30679285692.

The previous prime is 31144123397. The next prime is 31144123453. The reversal of 31144123421 is 12432144113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12432144113 = 59 ⋅210714307.

It is a cyclic number.

It is not a de Polignac number, because 31144123421 - 2¹⁰ = 31144122397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144123481) 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, 232418765 + ... + 232418898.

It is an arithmetic number, because the mean of its divisors is an integer number (7902240288).

Almost surely, 2^31144123421 is an apocalyptic number.

It is an amenable number.

31144123421 is a deficient number, since it is larger than the sum of its proper divisors (464837731).

31144123421 is an equidigital number, since it uses as much as digits as its factorization.

31144123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464837730.

The product of its digits is 2304, while the sum is 26.

Adding to 31144123421 its reverse (12432144113), we get a palindrome (43576267534).

The spelling of 31144123421 in words is "thirty-one billion, one hundred forty-four million, one hundred twenty-three thousand, four hundred twenty-one".