21901173006 has 16 divisors (see below), whose sum is σ = 43805911248. Its totient is φ = 7299796800.

The previous prime is 21901173001. The next prime is 21901173013. The reversal of 21901173006 is 60037110912.

It is a super-2 number, since 2×21901173006² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901173001) 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, 65085 + ... + 219176.

It is an arithmetic number, because the mean of its divisors is an integer number (2737869453).

Almost surely, 2^21901173006 is an apocalyptic number.

21901173006 is an abundant number, since it is smaller than the sum of its proper divisors (21904738242).

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

21901173006 is a wasteful number, since it uses less digits than its factorization.

21901173006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297107.

The product of its (nonzero) digits is 2268, while the sum is 30.

Adding to 21901173006 its reverse (60037110912), we get a palindrome (81938283918).

The spelling of 21901173006 in words is "twenty-one billion, nine hundred one million, one hundred seventy-three thousand, six".