31535103421 has 4 divisors (see below), whose sum is σ = 31573514844. Its totient is φ = 31496692000.

The previous prime is 31535103337. The next prime is 31535103433. The reversal of 31535103421 is 12430153513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12430153513 = 107 ⋅116169659.

It can be written as a sum of positive squares in 2 ways, for example, as 6122280025 + 25412823396 = 78245^2 + 159414^2 .

It is a cyclic number.

It is not a de Polignac number, because 31535103421 - 2¹¹ = 31535101373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31535103421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31535103521) 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, 19204480 + ... + 19206121.

It is an arithmetic number, because the mean of its divisors is an integer number (7893378711).

Almost surely, 2^31535103421 is an apocalyptic number.

It is an amenable number.

31535103421 is a deficient number, since it is larger than the sum of its proper divisors (38411423).

31535103421 is an equidigital number, since it uses as much as digits as its factorization.

31535103421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38411422.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 31535103421 its reverse (12430153513), we get a palindrome (43965256934).

The spelling of 31535103421 in words is "thirty-one billion, five hundred thirty-five million, one hundred three thousand, four hundred twenty-one".