31201221023 has 8 divisors (see below), whose sum is σ = 35689208448. Its totient is φ = 26720901144.

The previous prime is 31201221011. The next prime is 31201221041. The reversal of 31201221023 is 32012210213.

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

It is not a de Polignac number, because 31201221023 - 2¹⁰ = 31201219999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31201220992 and 31201221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201221083) 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, 1908161 + ... + 1924442.

It is an arithmetic number, because the mean of its divisors is an integer number (4461151056).

Almost surely, 2^31201221023 is an apocalyptic number.

31201221023 is a deficient number, since it is larger than the sum of its proper divisors (4487987425).

31201221023 is a wasteful number, since it uses less digits than its factorization.

31201221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833773.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31201221023 its reverse (32012210213), we get a palindrome (63213431236).

The spelling of 31201221023 in words is "thirty-one billion, two hundred one million, two hundred twenty-one thousand, twenty-three".