21055507106 has 8 divisors (see below), whose sum is σ = 31584319680. Its totient is φ = 10527400548.

The previous prime is 21055507093. The next prime is 21055507139. The reversal of 21055507106 is 60170555012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94286 + ... + 225833.

It is an arithmetic number, because the mean of its divisors is an integer number (3948039960).

Almost surely, 2^21055507106 is an apocalyptic number.

21055507106 is a deficient number, since it is larger than the sum of its proper divisors (10528812574).

21055507106 is a wasteful number, since it uses less digits than its factorization.

21055507106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353008.

The product of its (nonzero) digits is 10500, while the sum is 32.

The spelling of 21055507106 in words is "twenty-one billion, fifty-five million, five hundred seven thousand, one hundred six".