21101200231 has 2 divisors, whose sum is σ = 21101200232. Its totient is φ = 21101200230.

The previous prime is 21101200189. The next prime is 21101200283. The reversal of 21101200231 is 13200210112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101200231 - 2¹⁷ = 21101069159 is a prime.

It is a super-2 number, since 2×21101200231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101203231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550600115 + 10550600116.

It is an arithmetic number, because the mean of its divisors is an integer number (10550600116).

Almost surely, 2^21101200231 is an apocalyptic number.

21101200231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101200231 is an equidigital number, since it uses as much as digits as its factorization.

21101200231 is an evil number, because the sum of its binary digits is even.

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

Adding to 21101200231 its reverse (13200210112), we get a palindrome (34301410343).

The spelling of 21101200231 in words is "twenty-one billion, one hundred one million, two hundred thousand, two hundred thirty-one".