21055023206 has 8 divisors (see below), whose sum is σ = 36094325520. Its totient is φ = 9023581368.

The previous prime is 21055023173. The next prime is 21055023221. The reversal of 21055023206 is 60232055012.

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

It is a congruent 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, 751965101 + ... + 751965128.

It is an arithmetic number, because the mean of its divisors is an integer number (4511790690).

Almost surely, 2^21055023206 is an apocalyptic number.

21055023206 is a deficient number, since it is larger than the sum of its proper divisors (15039302314).

21055023206 is a wasteful number, since it uses less digits than its factorization.

21055023206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503930238.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21055023206 its reverse (60232055012), we get a palindrome (81287078218).

The spelling of 21055023206 in words is "twenty-one billion, fifty-five million, twenty-three thousand, two hundred six".