31023330110021 has 4 divisors (see below), whose sum is σ = 31158803167500. Its totient is φ = 30887857052544.

The previous prime is 31023330110011. The next prime is 31023330110053. The reversal of 31023330110021 is 12001103332013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29256318205921 + 1767011904100 = 5408911^2 + 1329290^2 .

It is a cyclic number.

It is not a de Polignac number, because 31023330110021 - 2¹⁸ = 31023329847877 is a prime.

It is a super-2 number, since 2×31023330110021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31023330109975 and 31023330110002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023330110011) 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, 67736528396 + ... + 67736528853.

It is an arithmetic number, because the mean of its divisors is an integer number (7789700791875).

Almost surely, 2^{31023330110021} is an apocalyptic number.

It is an amenable number.

31023330110021 is a deficient number, since it is larger than the sum of its proper divisors (135473057479).

31023330110021 is a wasteful number, since it uses less digits than its factorization.

31023330110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135473057478.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31023330110021 its reverse (12001103332013), we get a palindrome (43024433442034).

The spelling of 31023330110021 in words is "thirty-one trillion, twenty-three billion, three hundred thirty million, one hundred ten thousand, twenty-one".