21310244033 has 8 divisors (see below), whose sum is σ = 22952601000. Its totient is φ = 19668331008.

The previous prime is 21310243961. The next prime is 21310244047. The reversal of 21310244033 is 33044201312.

It can be written as a sum of positive squares in 4 ways, for example, as 3399239809 + 17911004224 = 58303^2 + 133832^2 .

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 21310244033 - 2⁸ = 21310243777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310244063) 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, 7718 + ... + 206591.

It is an arithmetic number, because the mean of its divisors is an integer number (2869075125).

Almost surely, 2^21310244033 is an apocalyptic number.

It is an amenable number.

21310244033 is a deficient number, since it is larger than the sum of its proper divisors (1642356967).

21310244033 is a wasteful number, since it uses less digits than its factorization.

21310244033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221971.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21310244033 its reverse (33044201312), we get a palindrome (54354445345).

The spelling of 21310244033 in words is "twenty-one billion, three hundred ten million, two hundred forty-four thousand, thirty-three".