21231002013 has 16 divisors (see below), whose sum is σ = 30497206656. Its totient is φ = 13060232640.

The previous prime is 21231001991. The next prime is 21231002027. The reversal of 21231002013 is 31020013212.

It is not a de Polignac number, because 21231002013 - 2²¹ = 21228904861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231001983 and 21231002001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231000013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403 + ... + 206063.

It is an arithmetic number, because the mean of its divisors is an integer number (1906075416).

Almost surely, 2^21231002013 is an apocalyptic number.

It is an amenable number.

21231002013 is a deficient number, since it is larger than the sum of its proper divisors (9266204643).

21231002013 is a wasteful number, since it uses less digits than its factorization.

21231002013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208324.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21231002013 its reverse (31020013212), we get a palindrome (52251015225).

The spelling of 21231002013 in words is "twenty-one billion, two hundred thirty-one million, two thousand, thirteen".