21302102221 has 32 divisors (see below), whose sum is σ = 22768128000. Its totient is φ = 19898161920.

The previous prime is 21302102219. The next prime is 21302102249. The reversal of 21302102221 is 12220120312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21302102221 - 2¹ = 21302102219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302102195 and 21302102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302102821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43741240 + ... + 43741726.

It is an arithmetic number, because the mean of its divisors is an integer number (711504000).

Almost surely, 2^21302102221 is an apocalyptic number.

It is an amenable number.

21302102221 is a deficient number, since it is larger than the sum of its proper divisors (1466025779).

21302102221 is a wasteful number, since it uses less digits than its factorization.

21302102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21302102221 its reverse (12220120312), we get a palindrome (33522222533).

The spelling of 21302102221 in words is "twenty-one billion, three hundred two million, one hundred two thousand, two hundred twenty-one".