21010130221 has 16 divisors (see below), whose sum is σ = 23151018240. Its totient is φ = 18977969920.

The previous prime is 21010130189. The next prime is 21010130233. The reversal of 21010130221 is 12203101012.

It is a cyclic number.

It is not a de Polignac number, because 21010130221 - 2⁵ = 21010130189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010130261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45265 + ... + 209926.

It is an arithmetic number, because the mean of its divisors is an integer number (1446938640).

Almost surely, 2^21010130221 is an apocalyptic number.

It is an amenable number.

21010130221 is a deficient number, since it is larger than the sum of its proper divisors (2140888019).

21010130221 is a wasteful number, since it uses less digits than its factorization.

21010130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255404.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21010130221 its reverse (12203101012), we get a palindrome (33213231233).

The spelling of 21010130221 in words is "twenty-one billion, ten million, one hundred thirty thousand, two hundred twenty-one".