31121321101 has 12 divisors (see below), whose sum is σ = 33738005172. Its totient is φ = 28694480256.

The previous prime is 31121321083. The next prime is 31121321113. The reversal of 31121321101 is 10112312113.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 460960900 + 30660360201 = 21470^2 + 175101^2 .

It is not a de Polignac number, because 31121321101 - 2⁷ = 31121320973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121321141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43225 + ... + 253201.

It is an arithmetic number, because the mean of its divisors is an integer number (2811500431).

Almost surely, 2^31121321101 is an apocalyptic number.

It is an amenable number.

31121321101 is a deficient number, since it is larger than the sum of its proper divisors (2616684071).

31121321101 is a wasteful number, since it uses less digits than its factorization.

31121321101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210880 (or 210867 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31121321101 its reverse (10112312113), we get a palindrome (41233633214).

The spelling of 31121321101 in words is "thirty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred one".