31433220424421 has 4 divisors (see below), whose sum is σ = 31460529913344. Its totient is φ = 31405910935500.

The previous prime is 31433220424393. The next prime is 31433220424439. The reversal of 31433220424421 is 12442402233413.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 31433220424421 - 2⁶ = 31433220424357 is a prime.

It is a super-2 number, since 2×31433220424421² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31433220424481) 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, 13654742735 + ... + 13654745036.

It is an arithmetic number, because the mean of its divisors is an integer number (7865132478336).

Almost surely, 2^{31433220424421} is an apocalyptic number.

It is an amenable number.

31433220424421 is a deficient number, since it is larger than the sum of its proper divisors (27309488923).

31433220424421 is a wasteful number, since it uses less digits than its factorization.

31433220424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27309488922.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 31433220424421 its reverse (12442402233413), we get a palindrome (43875622657834).

The spelling of 31433220424421 in words is "thirty-one trillion, four hundred thirty-three billion, two hundred twenty million, four hundred twenty-four thousand, four hundred twenty-one".