21040468045 has 24 divisors (see below), whose sum is σ = 26968618656. Its totient is φ = 15754221792.

The previous prime is 21040468021. The next prime is 21040468061. The reversal of 21040468045 is 54086404012.

It is not a de Polignac number, because 21040468045 - 2¹⁷ = 21040336973 is a prime.

It is a super-2 number, since 2×21040468045² (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 21040468045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79594 + ... + 220036.

It is an arithmetic number, because the mean of its divisors is an integer number (1123692444).

Almost surely, 2^21040468045 is an apocalyptic number.

It is an amenable number.

21040468045 is a deficient number, since it is larger than the sum of its proper divisors (5928150611).

21040468045 is a wasteful number, since it uses less digits than its factorization.

21040468045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140569 (or 140550 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The spelling of 21040468045 in words is "twenty-one billion, forty million, four hundred sixty-eight thousand, forty-five".