31030212121031 has 4 divisors (see below), whose sum is σ = 31030244404392. Its totient is φ = 31030179837672.

The previous prime is 31030212121021. The next prime is 31030212121043. The reversal of 31030212121031 is 13012121203013.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31030212121031 is a prime.

It is a super-2 number, since 2×31030212121031² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31030212120994 and 31030212121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030212121021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14654216 + ... + 16637501.

It is an arithmetic number, because the mean of its divisors is an integer number (7757561101098).

Almost surely, 2^{31030212121031} is an apocalyptic number.

31030212121031 is a deficient number, since it is larger than the sum of its proper divisors (32283361).

31030212121031 is an equidigital number, since it uses as much as digits as its factorization.

31030212121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32283360.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31030212121031 its reverse (13012121203013), we get a palindrome (44042333324044).

The spelling of 31030212121031 in words is "thirty-one trillion, thirty billion, two hundred twelve million, one hundred twenty-one thousand, thirty-one".