31401333100021 has 4 divisors (see below), whose sum is σ = 31416733461600. Its totient is φ = 31385932738444.

The previous prime is 31401333099973. The next prime is 31401333100063. The reversal of 31401333100021 is 12000133310413.

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 31401333100021 - 2²¹ = 31401331002869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31401333099965 and 31401333100001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401333109021) 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, 7700177731 + ... + 7700181808.

It is an arithmetic number, because the mean of its divisors is an integer number (7854183365400).

Almost surely, 2^{31401333100021} is an apocalyptic number.

It is an amenable number.

31401333100021 is a deficient number, since it is larger than the sum of its proper divisors (15400361579).

31401333100021 is a wasteful number, since it uses less digits than its factorization.

31401333100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15400361578.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31401333100021 its reverse (12000133310413), we get a palindrome (43401466410434).

The spelling of 31401333100021 in words is "thirty-one trillion, four hundred one billion, three hundred thirty-three million, one hundred thousand, twenty-one".