21330001231 has 16 divisors (see below), whose sum is σ = 26856557568. Its totient is φ = 16456212000.

The previous prime is 21330001229. The next prime is 21330001289. The reversal of 21330001231 is 13210003312.

It is a cyclic number.

It is not a de Polignac number, because 21330001231 - 2¹ = 21330001229 is a prime.

It is a super-2 number, since 2×21330001231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330004231) 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, 1363575 + ... + 1379128.

It is an arithmetic number, because the mean of its divisors is an integer number (1678534848).

Almost surely, 2^21330001231 is an apocalyptic number.

21330001231 is a deficient number, since it is larger than the sum of its proper divisors (5526556337).

21330001231 is a wasteful number, since it uses less digits than its factorization.

21330001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742822.

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

Adding to 21330001231 its reverse (13210003312), we get a palindrome (34540004543).

The spelling of 21330001231 in words is "twenty-one billion, three hundred thirty million, one thousand, two hundred thirty-one".