21231330001 has 12 divisors (see below), whose sum is σ = 25035998052. Its totient is φ = 17948988288.

The previous prime is 21231329993. The next prime is 21231330017. The reversal of 21231330001 is 10003313212.

It can be written as a sum of positive squares in 2 ways, for example, as 12221523601 + 9009806400 = 110551^2 + 94920^2 .

It is not a de Polignac number, because 21231330001 - 2³ = 21231329993 is a prime.

It is a super-2 number, since 2×21231330001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231330091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2964180 + ... + 2971333.

It is an arithmetic number, because the mean of its divisors is an integer number (2086333171).

Almost surely, 2^21231330001 is an apocalyptic number.

It is an amenable number.

21231330001 is a deficient number, since it is larger than the sum of its proper divisors (3804668051).

21231330001 is an equidigital number, since it uses as much as digits as its factorization.

21231330001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935600 (or 5935593 counting only the distinct ones).

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

Adding to 21231330001 its reverse (10003313212), we get a palindrome (31234643213).

The spelling of 21231330001 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty thousand, one".