31020131220101 has 8 divisors (see below), whose sum is σ = 31053647812824. Its totient is φ = 30986632696320.

The previous prime is 31020131220097. The next prime is 31020131220119. The reversal of 31020131220101 is 10102213102013.

It can be written as a sum of positive squares in 4 ways, for example, as 14552775336100 + 16467355884001 = 3814810^2 + 4057999^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31020131220101 - 2² = 31020131220097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31020131220101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020131220121) 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, 1080440 + ... + 7950321.

It is an arithmetic number, because the mean of its divisors is an integer number (3881705976603).

Almost surely, 2^{31020131220101} is an apocalyptic number.

It is an amenable number.

31020131220101 is a deficient number, since it is larger than the sum of its proper divisors (33516592723).

31020131220101 is a wasteful number, since it uses less digits than its factorization.

31020131220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034471.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31020131220101 its reverse (10102213102013), we get a palindrome (41122344322114).

The spelling of 31020131220101 in words is "thirty-one trillion, twenty billion, one hundred thirty-one million, two hundred twenty thousand, one hundred one".