10031281921 has 4 divisors (see below), whose sum is σ = 10076265472. Its totient is φ = 9986298372.

The previous prime is 10031281913. The next prime is 10031281979. The reversal of 10031281921 is 12918213001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10031281921 - 2³ = 10031281913 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 10031281921.

It is not an unprimeable number, because it can be changed into a prime (10031581921) 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, 22491441 + ... + 22491886.

It is an arithmetic number, because the mean of its divisors is an integer number (2519066368).

Almost surely, 2^10031281921 is an apocalyptic number.

It is an amenable number.

10031281921 is a deficient number, since it is larger than the sum of its proper divisors (44983551).

10031281921 is an equidigital number, since it uses as much as digits as its factorization.

10031281921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44983550.

The product of its (nonzero) digits is 864, while the sum is 28.

Adding to 10031281921 its reverse (12918213001), we get a palindrome (22949494922).

The spelling of 10031281921 in words is "ten billion, thirty-one million, two hundred eighty-one thousand, nine hundred twenty-one".