21030231013 has 4 divisors (see below), whose sum is σ = 22942070208. Its totient is φ = 19118391820.

The previous prime is 21030230999. The next prime is 21030231029. The reversal of 21030231013 is 31013203012.

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 not a de Polignac number, because 21030231013 - 2¹⁷ = 21030099941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030231083) 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, 955919581 + ... + 955919602.

It is an arithmetic number, because the mean of its divisors is an integer number (5735517552).

Almost surely, 2^21030231013 is an apocalyptic number.

It is an amenable number.

21030231013 is a deficient number, since it is larger than the sum of its proper divisors (1911839195).

21030231013 is a wasteful number, since it uses less digits than its factorization.

21030231013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911839194.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21030231013 its reverse (31013203012), we get a palindrome (52043434025).

The spelling of 21030231013 in words is "twenty-one billion, thirty million, two hundred thirty-one thousand, thirteen".