21549318610 has 16 divisors (see below), whose sum is σ = 40040024832. Its totient is φ = 8341671600.

The previous prime is 21549318599. The next prime is 21549318611. The reversal of 21549318610 is 1681394512.

It is not an unprimeable number, because it can be changed into a prime (21549318611) 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, 34756656 + ... + 34757275.

It is an arithmetic number, because the mean of its divisors is an integer number (2502501552).

Almost surely, 2^21549318610 is an apocalyptic number.

21549318610 is a deficient number, since it is larger than the sum of its proper divisors (18490706222).

21549318610 is a wasteful number, since it uses less digits than its factorization.

21549318610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69513969.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 21549318610 in words is "twenty-one billion, five hundred forty-nine million, three hundred eighteen thousand, six hundred ten".