21738728045 has 8 divisors (see below), whose sum is σ = 26693136096. Its totient is φ = 16986540816.

The previous prime is 21738728041. The next prime is 21738728101. The reversal of 21738728045 is 54082783712.

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 21738728045 - 2² = 21738728041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21738728041) 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, 50554967 + ... + 50555396.

It is an arithmetic number, because the mean of its divisors is an integer number (3336642012).

Almost surely, 2^21738728045 is an apocalyptic number.

It is an amenable number.

21738728045 is a deficient number, since it is larger than the sum of its proper divisors (4954408051).

21738728045 is a wasteful number, since it uses less digits than its factorization.

21738728045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101110411.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 21738728045 in words is "twenty-one billion, seven hundred thirty-eight million, seven hundred twenty-eight thousand, forty-five".