21170430270 has 256 divisors, whose sum is σ = 65094451200. Its totient is φ = 4845709440.

The previous prime is 21170430251. The next prime is 21170430311. The reversal of 21170430270 is 7203407112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5394529 + ... + 5398451.

It is an arithmetic number, because the mean of its divisors is an integer number (254275200).

Almost surely, 2^21170430270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21170430270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32547225600).

21170430270 is an abundant number, since it is smaller than the sum of its proper divisors (43924020930).

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

21170430270 is a wasteful number, since it uses less digits than its factorization.

21170430270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052 (or 4046 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

Adding to 21170430270 its reverse (7203407112), we get a palindrome (28373837382).

The spelling of 21170430270 in words is "twenty-one billion, one hundred seventy million, four hundred thirty thousand, two hundred seventy".