31230130021031 has 4 divisors (see below), whose sum is σ = 31417136787792. Its totient is φ = 31043123254272.

The previous prime is 31230130021009. The next prime is 31230130021043. The reversal of 31230130021031 is 13012003103213.

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

It is a cyclic number.

It is not a de Polignac number, because 31230130021031 - 2¹⁰ = 31230130020007 is a prime.

It is a super-2 number, since 2×31230130021031² (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 = 31230130020994 and 31230130021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230130051031) 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, 93503383130 + ... + 93503383463.

It is an arithmetic number, because the mean of its divisors is an integer number (7854284196948).

Almost surely, 2^{31230130021031} is an apocalyptic number.

31230130021031 is a deficient number, since it is larger than the sum of its proper divisors (187006766761).

31230130021031 is a wasteful number, since it uses less digits than its factorization.

31230130021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187006766760.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31230130021031 its reverse (13012003103213), we get a palindrome (44242133124244).

The spelling of 31230130021031 in words is "thirty-one trillion, two hundred thirty billion, one hundred thirty million, twenty-one thousand, thirty-one".