21145306576 has 20 divisors (see below), whose sum is σ = 41060290500. Its totient is φ = 10549102592.

The previous prime is 21145306447. The next prime is 21145306577. The reversal of 21145306576 is 67560354112.

It can be written as a sum of positive squares in 2 ways, for example, as 8158424976 + 12986881600 = 90324^2 + 113960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145306577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464511 + ... + 1478878.

It is an arithmetic number, because the mean of its divisors is an integer number (2053014525).

Almost surely, 2^21145306576 is an apocalyptic number.

It is an amenable number.

21145306576 is a deficient number, since it is larger than the sum of its proper divisors (19914983924).

21145306576 is a wasteful number, since it uses less digits than its factorization.

21145306576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943846 (or 2943840 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 21145306576 in words is "twenty-one billion, one hundred forty-five million, three hundred six thousand, five hundred seventy-six".