21517225070 has 128 divisors (see below), whose sum is σ = 45498931200. Its totient is φ = 7243689600.

The previous prime is 21517225049. The next prime is 21517225141. The reversal of 21517225070 is 7052271512.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26017997 + ... + 26018823.

It is an arithmetic number, because the mean of its divisors is an integer number (355460400).

Almost surely, 2^21517225070 is an apocalyptic number.

21517225070 is an abundant number, since it is smaller than the sum of its proper divisors (23981706130).

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

21517225070 is a wasteful number, since it uses less digits than its factorization.

21517225070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134.

The product of its (nonzero) digits is 9800, while the sum is 32.

Adding to 21517225070 its reverse (7052271512), we get a palindrome (28569496582).

The spelling of 21517225070 in words is "twenty-one billion, five hundred seventeen million, two hundred twenty-five thousand, seventy".