31113102320021 has 8 divisors (see below), whose sum is σ = 33065750557080. Its totient is φ = 29174061388288.

The previous prime is 31113102319993. The next prime is 31113102320023. The reversal of 31113102320021 is 12002320131113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 569640015025 + 30543462304996 = 754745^2 + 5526614^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31113102320021 is a prime.

It is a super-2 number, since 2×31113102320021² (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 = 31113102319975 and 31113102320002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113102320023) 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, 3401821616 + ... + 3401830761.

It is an arithmetic number, because the mean of its divisors is an integer number (4133218819635).

Almost surely, 2^{31113102320021} is an apocalyptic number.

It is an amenable number.

31113102320021 is a deficient number, since it is larger than the sum of its proper divisors (1952648237059).

31113102320021 is a wasteful number, since it uses less digits than its factorization.

31113102320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6803652663.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31113102320021 its reverse (12002320131113), we get a palindrome (43115422451134).

The spelling of 31113102320021 in words is "thirty-one trillion, one hundred thirteen billion, one hundred two million, three hundred twenty thousand, twenty-one".