21210300231 has 4 divisors (see below), whose sum is σ = 28280400312. Its totient is φ = 14140200152.

The previous prime is 21210300211. The next prime is 21210300239. The reversal of 21210300231 is 13200301212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21210300231 - 2¹⁴ = 21210283847 is a prime.

It is a super-2 number, since 2×21210300231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21210300231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210300239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535050036 + ... + 3535050041.

It is an arithmetic number, because the mean of its divisors is an integer number (7070100078).

Almost surely, 2^21210300231 is an apocalyptic number.

21210300231 is a deficient number, since it is larger than the sum of its proper divisors (7070100081).

21210300231 is an equidigital number, since it uses as much as digits as its factorization.

21210300231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070100080.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21210300231 its reverse (13200301212), we get a palindrome (34410601443).

The spelling of 21210300231 in words is "twenty-one billion, two hundred ten million, three hundred thousand, two hundred thirty-one".