21200033345 has 8 divisors (see below), whose sum is σ = 26936513064. Its totient is φ = 15962377984.

The previous prime is 21200033321. The next prime is 21200033381. The reversal of 21200033345 is 54333000212.

It can be written as a sum of positive squares in 4 ways, for example, as 2003099536 + 19196933809 = 44756^2 + 138553^2 .

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 21200033345 - 2⁸ = 21200033089 is a prime.

It is a super-2 number, since 2×21200033345² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200033345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124705994 + ... + 124706163.

It is an arithmetic number, because the mean of its divisors is an integer number (3367064133).

Almost surely, 2^21200033345 is an apocalyptic number.

It is an amenable number.

21200033345 is a deficient number, since it is larger than the sum of its proper divisors (5736479719).

21200033345 is a wasteful number, since it uses less digits than its factorization.

21200033345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249412179.

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 21200033345 its reverse (54333000212), we get a palindrome (75533033557).

The spelling of 21200033345 in words is "twenty-one billion, two hundred million, thirty-three thousand, three hundred forty-five".