21333345601 has 4 divisors (see below), whose sum is σ = 21352864852. Its totient is φ = 21313826352.

The previous prime is 21333345469. The next prime is 21333345617. The reversal of 21333345601 is 10654333312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17167288576 + 4166057025 = 131024^2 + 64545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21333345601 is a prime.

It is a super-2 number, since 2×21333345601² (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 (21333342601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9757986 + ... + 9760171.

It is an arithmetic number, because the mean of its divisors is an integer number (5338216213).

Almost surely, 2^21333345601 is an apocalyptic number.

It is an amenable number.

21333345601 is a deficient number, since it is larger than the sum of its proper divisors (19519251).

21333345601 is a wasteful number, since it uses less digits than its factorization.

21333345601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19519250.

The product of its (nonzero) digits is 19440, while the sum is 31.

Adding to 21333345601 its reverse (10654333312), we get a palindrome (31987678913).

The spelling of 21333345601 in words is "twenty-one billion, three hundred thirty-three million, three hundred forty-five thousand, six hundred one".