21003333345 has 32 divisors (see below), whose sum is σ = 37688250240. Its totient is φ = 11097080640.

The previous prime is 21003333319. The next prime is 21003333353. The reversal of 21003333345 is 54333330012.

It is a happy number.

It is not a de Polignac number, because 21003333345 - 2⁵ = 21003333313 is a prime.

It is a super-2 number, since 2×21003333345² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712566 + ... + 741455.

It is an arithmetic number, because the mean of its divisors is an integer number (1177757820).

Almost surely, 2^21003333345 is an apocalyptic number.

It is an amenable number.

21003333345 is a deficient number, since it is larger than the sum of its proper divisors (16684916895).

21003333345 is a wasteful number, since it uses less digits than its factorization.

21003333345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454142 (or 1454136 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 27.

Adding to 21003333345 its reverse (54333330012), we get a palindrome (75336663357).

The spelling of 21003333345 in words is "twenty-one billion, three million, three hundred thirty-three thousand, three hundred forty-five".