21302231101 has 2 divisors, whose sum is σ = 21302231102. Its totient is φ = 21302231100.

The previous prime is 21302231087. The next prime is 21302231147. The reversal of 21302231101 is 10113220312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13075922500 + 8226308601 = 114350^2 + 90699^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302231101 - 2¹⁹ = 21301706813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302231801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651115550 + 10651115551.

It is an arithmetic number, because the mean of its divisors is an integer number (10651115551).

Almost surely, 2^21302231101 is an apocalyptic number.

It is an amenable number.

21302231101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302231101 is an equidigital number, since it uses as much as digits as its factorization.

21302231101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21302231101 its reverse (10113220312), we get a palindrome (31415451413).

The spelling of 21302231101 in words is "twenty-one billion, three hundred two million, two hundred thirty-one thousand, one hundred one".