31211033421 has 4 divisors (see below), whose sum is σ = 41614711232. Its totient is φ = 20807355612.

The previous prime is 31211033417. The next prime is 31211033423. The reversal of 31211033421 is 12433011213.

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.

It is not a de Polignac number, because 31211033421 - 2² = 31211033417 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 (31211033423) 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, 5201838901 + ... + 5201838906.

It is an arithmetic number, because the mean of its divisors is an integer number (10403677808).

Almost surely, 2^31211033421 is an apocalyptic number.

It is an amenable number.

31211033421 is a deficient number, since it is larger than the sum of its proper divisors (10403677811).

31211033421 is a wasteful number, since it uses less digits than its factorization.

31211033421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10403677810.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31211033421 its reverse (12433011213), we get a palindrome (43644044634).

The spelling of 31211033421 in words is "thirty-one billion, two hundred eleven million, thirty-three thousand, four hundred twenty-one".