21212322231 has 8 divisors (see below), whose sum is σ = 28372318704. Its totient is φ = 14096936960.

The previous prime is 21212322227. The next prime is 21212322269. The reversal of 21212322231 is 13222321212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212322231 - 2² = 21212322227 is a prime.

It is a super-2 number, since 2×21212322231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212322198 and 21212322207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212322221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11151690 + ... + 11153591.

It is an arithmetic number, because the mean of its divisors is an integer number (3546539838).

Almost surely, 2^21212322231 is an apocalyptic number.

21212322231 is a deficient number, since it is larger than the sum of its proper divisors (7159996473).

21212322231 is a wasteful number, since it uses less digits than its factorization.

21212322231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22305601.

The product of its digits is 576, while the sum is 21.

Adding to 21212322231 its reverse (13222321212), we get a palindrome (34434643443).

The spelling of 21212322231 in words is "twenty-one billion, two hundred twelve million, three hundred twenty-two thousand, two hundred thirty-one".