31021421421 has 16 divisors (see below), whose sum is σ = 42550297344. Its totient is φ = 20093170944.

The previous prime is 31021421413. The next prime is 31021421441. The reversal of 31021421421 is 12412412013.

It is not a de Polignac number, because 31021421421 - 2³ = 31021421413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021421401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 783640 + ... + 822273.

It is an arithmetic number, because the mean of its divisors is an integer number (2659393584).

Almost surely, 2^31021421421 is an apocalyptic number.

It is an amenable number.

31021421421 is a deficient number, since it is larger than the sum of its proper divisors (11528875923).

31021421421 is a wasteful number, since it uses less digits than its factorization.

31021421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606100.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 31021421421 its reverse (12412412013), we get a palindrome (43433833434).

The spelling of 31021421421 in words is "thirty-one billion, twenty-one million, four hundred twenty-one thousand, four hundred twenty-one".