31200021101 has 2 divisors, whose sum is σ = 31200021102. Its totient is φ = 31200021100.

The previous prime is 31200021091. The next prime is 31200021109. The reversal of 31200021101 is 10112000213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28476225001 + 2723796100 = 168749^2 + 52190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200021101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31200021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600010550 + 15600010551.

It is an arithmetic number, because the mean of its divisors is an integer number (15600010551).

Almost surely, 2^31200021101 is an apocalyptic number.

It is an amenable number.

31200021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200021101 is an equidigital number, since it uses as much as digits as its factorization.

31200021101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31200021101 its reverse (10112000213), we get a palindrome (41312021314).

The spelling of 31200021101 in words is "thirty-one billion, two hundred million, twenty-one thousand, one hundred one".