21605060140 has 96 divisors (see below), whose sum is σ = 46702656000. Its totient is φ = 8392668672.

The previous prime is 21605060131. The next prime is 21605060159. The reversal of 21605060140 is 4106050612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49214041 + ... + 49214479.

It is an arithmetic number, because the mean of its divisors is an integer number (486486000).

Almost surely, 2^21605060140 is an apocalyptic number.

21605060140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21605060140 is an abundant number, since it is smaller than the sum of its proper divisors (25097595860).

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

21605060140 is a wasteful number, since it uses less digits than its factorization.

21605060140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 21605060140 in words is "twenty-one billion, six hundred five million, sixty thousand, one hundred forty".