21540223470730 has 16 divisors (see below), whose sum is σ = 38772464699880. Its totient is φ = 8616075509952.

The previous prime is 21540223470719. The next prime is 21540223470737. The reversal of 21540223470730 is 3707432204512.

It can be written as a sum of positive squares in 4 ways, for example, as 5925246877489 + 15614976593241 = 2434183^2 + 3951579^2 .

It is not an unprimeable number, because it can be changed into a prime (21540223470737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6768832 + ... + 9428548.

Almost surely, 2^{21540223470730} is an apocalyptic number.

21540223470730 is a deficient number, since it is larger than the sum of its proper divisors (17232241229150).

21540223470730 is a wasteful number, since it uses less digits than its factorization.

21540223470730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469593.

The product of its (nonzero) digits is 282240, while the sum is 40.

The spelling of 21540223470730 in words is "twenty-one trillion, five hundred forty billion, two hundred twenty-three million, four hundred seventy thousand, seven hundred thirty".