31021023133 has 2 divisors, whose sum is σ = 31021023134. Its totient is φ = 31021023132.

The previous prime is 31021023091. The next prime is 31021023199. The reversal of 31021023133 is 33132012013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23809107204 + 7211915929 = 154302^2 + 84923^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021023133 - 2²¹ = 31018925981 is a prime.

It is a super-2 number, since 2×31021023133² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31021023133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31021023233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510511566 + 15510511567.

It is an arithmetic number, because the mean of its divisors is an integer number (15510511567).

Almost surely, 2^31021023133 is an apocalyptic number.

It is an amenable number.

31021023133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021023133 is an equidigital number, since it uses as much as digits as its factorization.

31021023133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31021023133 its reverse (33132012013), we get a palindrome (64153035146).

The spelling of 31021023133 in words is "thirty-one billion, twenty-one million, twenty-three thousand, one hundred thirty-three".