21245224331 has 8 divisors (see below), whose sum is σ = 21404749824. Its totient is φ = 21086202280.

The previous prime is 21245224291. The next prime is 21245224339. The reversal of 21245224331 is 13342254212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21245224331 - 2⁶ = 21245224267 is a prime.

It is a super-2 number, since 2×21245224331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21245224294 and 21245224303.

It is not an unprimeable number, because it can be changed into a prime (21245224339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40931 + ... + 210156.

It is an arithmetic number, because the mean of its divisors is an integer number (2675593728).

Almost surely, 2^21245224331 is an apocalyptic number.

21245224331 is a deficient number, since it is larger than the sum of its proper divisors (159525493).

21245224331 is a wasteful number, since it uses less digits than its factorization.

21245224331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251721.

The product of its digits is 11520, while the sum is 29.

Adding to 21245224331 its reverse (13342254212), we get a palindrome (34587478543).

The spelling of 21245224331 in words is "twenty-one billion, two hundred forty-five million, two hundred twenty-four thousand, three hundred thirty-one".