21011045315 has 16 divisors (see below), whose sum is σ = 27156537408. Its totient is φ = 15513676416.

The previous prime is 21011045311. The next prime is 21011045327. The reversal of 21011045315 is 51354011012.

It is a cyclic number.

It is not a de Polignac number, because 21011045315 - 2² = 21011045311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011045311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559469 + ... + 595841.

It is an arithmetic number, because the mean of its divisors is an integer number (1697283588).

Almost surely, 2^21011045315 is an apocalyptic number.

21011045315 is a deficient number, since it is larger than the sum of its proper divisors (6145492093).

21011045315 is a wasteful number, since it uses less digits than its factorization.

21011045315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45278.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21011045315 its reverse (51354011012), we get a palindrome (72365056327).

The spelling of 21011045315 in words is "twenty-one billion, eleven million, forty-five thousand, three hundred fifteen".