21012303345 has 32 divisors (see below), whose sum is σ = 36689466240. Its totient is φ = 10184048640.

The previous prime is 21012303271. The next prime is 21012303353. The reversal of 21012303345 is 54330321012.

It is not a de Polignac number, because 21012303345 - 2⁹ = 21012302833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458097 + ... + 501873.

It is an arithmetic number, because the mean of its divisors is an integer number (1146545820).

Almost surely, 2^21012303345 is an apocalyptic number.

It is an amenable number.

21012303345 is a deficient number, since it is larger than the sum of its proper divisors (15677162895).

21012303345 is a wasteful number, since it uses less digits than its factorization.

21012303345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46705.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21012303345 its reverse (54330321012), we get a palindrome (75342624357).

The spelling of 21012303345 in words is "twenty-one billion, twelve million, three hundred three thousand, three hundred forty-five".