31231211421 has 8 divisors (see below), whose sum is σ = 41645495520. Its totient is φ = 20818867472.

The previous prime is 31231211419. The next prime is 31231211437. The reversal of 31231211421 is 12411213213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31231211421 - 2¹ = 31231211419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231211471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447051 + ... + 512168.

It is an arithmetic number, because the mean of its divisors is an integer number (5205686940).

Almost surely, 2^31231211421 is an apocalyptic number.

It is an amenable number.

31231211421 is a deficient number, since it is larger than the sum of its proper divisors (10414284099).

31231211421 is a wasteful number, since it uses less digits than its factorization.

31231211421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970075.

The product of its digits is 288, while the sum is 21.

Adding to 31231211421 its reverse (12411213213), we get a palindrome (43642424634).

The spelling of 31231211421 in words is "thirty-one billion, two hundred thirty-one million, two hundred eleven thousand, four hundred twenty-one".