21545540322 has 16 divisors (see below), whose sum is σ = 43094633472. Its totient is φ = 7181254640.

The previous prime is 21545540279. The next prime is 21545540323. The reversal of 21545540322 is 22304554512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21545540323) 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, 65673 + ... + 217724.

It is an arithmetic number, because the mean of its divisors is an integer number (2693414592).

Almost surely, 2^21545540322 is an apocalyptic number.

21545540322 is an abundant number, since it is smaller than the sum of its proper divisors (21549093150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21545540322 is a wasteful number, since it uses less digits than its factorization.

21545540322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296073.

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 21545540322 in words is "twenty-one billion, five hundred forty-five million, five hundred forty thousand, three hundred twenty-two".