21011006345 has 32 divisors (see below), whose sum is σ = 30107911680. Its totient is φ = 13762805760.

The previous prime is 21011006339. The next prime is 21011006351. The reversal of 21011006345 is 54360011012.

It is an interprime number because it is at equal distance from previous prime (21011006339) and next prime (21011006351).

It is not a de Polignac number, because 21011006345 - 2⁸ = 21011006089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 21011006345.

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, 602075 + ... + 636015.

It is an arithmetic number, because the mean of its divisors is an integer number (940872240).

Almost surely, 2^21011006345 is an apocalyptic number.

It is an amenable number.

21011006345 is a deficient number, since it is larger than the sum of its proper divisors (9096905335).

21011006345 is a wasteful number, since it uses less digits than its factorization.

21011006345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34745.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21011006345 its reverse (54360011012), we get a palindrome (75371017357).

The spelling of 21011006345 in words is "twenty-one billion, eleven million, six thousand, three hundred forty-five".