21304727573 has 8 divisors (see below), whose sum is σ = 22693027392. Its totient is φ = 19931436736.

The previous prime is 21304727551. The next prime is 21304727579. The reversal of 21304727573 is 37572740312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21304727573 - 2³⁴ = 4124858389 is a prime.

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 21304727573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304727579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3749315 + ... + 3754992.

It is an arithmetic number, because the mean of its divisors is an integer number (2836628424).

Almost surely, 2^21304727573 is an apocalyptic number.

It is an amenable number.

21304727573 is a deficient number, since it is larger than the sum of its proper divisors (1388299819).

21304727573 is a wasteful number, since it uses less digits than its factorization.

21304727573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7504491.

The product of its (nonzero) digits is 246960, while the sum is 41.

The spelling of 21304727573 in words is "twenty-one billion, three hundred four million, seven hundred twenty-seven thousand, five hundred seventy-three".