21023210331 has 12 divisors (see below), whose sum is σ = 30542392608. Its totient is φ = 13934458224.

The previous prime is 21023210287. The next prime is 21023210333. The reversal of 21023210331 is 13301232012.

21023210331 is a `hidden beast` number, since 2 + 10 + 2 + 321 + 0 + 331 = 666.

It is not a de Polignac number, because 21023210331 - 2⁶ = 21023210267 is a prime.

It is a super-2 number, since 2×21023210331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21023210333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6749635 + ... + 6752748.

It is an arithmetic number, because the mean of its divisors is an integer number (2545199384).

Almost surely, 2^21023210331 is an apocalyptic number.

21023210331 is a deficient number, since it is larger than the sum of its proper divisors (9519182277).

21023210331 is a wasteful number, since it uses less digits than its factorization.

21023210331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13502562 (or 13502559 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21023210331 its reverse (13301232012), we get a palindrome (34324442343).

The spelling of 21023210331 in words is "twenty-one billion, twenty-three million, two hundred ten thousand, three hundred thirty-one".