21020231013 has 16 divisors (see below), whose sum is σ = 28197187200. Its totient is φ = 13928466240.

The previous prime is 21020230981. The next prime is 21020231027. The reversal of 21020231013 is 31013202012.

It is not a de Polignac number, because 21020231013 - 2⁵ = 21020230981 is a prime.

It is a super-2 number, since 2×21020231013² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21020230983 and 21020231001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020231033) 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, 1092208 + ... + 1111286.

It is an arithmetic number, because the mean of its divisors is an integer number (1762324200).

Almost surely, 2^21020231013 is an apocalyptic number.

It is an amenable number.

21020231013 is a deficient number, since it is larger than the sum of its proper divisors (7176956187).

21020231013 is a wasteful number, since it uses less digits than its factorization.

21020231013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21292.

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

Adding to 21020231013 its reverse (31013202012), we get a palindrome (52033433025).

The spelling of 21020231013 in words is "twenty-one billion, twenty million, two hundred thirty-one thousand, thirteen".