31202121113 has 6 divisors (see below), whose sum is σ = 33145506126. Its totient is φ = 29366701952.

The previous prime is 31202121107. The next prime is 31202121169. The reversal of 31202121113 is 31112120213.

It can be written as a sum of positive squares in 3 ways, for example, as 6057041929 + 25145079184 = 77827^2 + 158572^2 .

It is not a de Polignac number, because 31202121113 - 2¹⁸ = 31201858969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31202121091 and 31202121100.

It is not an unprimeable number, because it can be changed into a prime (31202121173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53982620 + ... + 53983197.

It is an arithmetic number, because the mean of its divisors is an integer number (5524251021).

Almost surely, 2^31202121113 is an apocalyptic number.

It is an amenable number.

31202121113 is a deficient number, since it is larger than the sum of its proper divisors (1943385013).

31202121113 is a wasteful number, since it uses less digits than its factorization.

31202121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107965851 (or 107965834 counting only the distinct ones).

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

Adding to 31202121113 its reverse (31112120213), we get a palindrome (62314241326).

The spelling of 31202121113 in words is "thirty-one billion, two hundred two million, one hundred twenty-one thousand, one hundred thirteen".