21212223122311 has 4 divisors (see below), whose sum is σ = 22843932593272. Its totient is φ = 19580513651352.

The previous prime is 21212223122287. The next prime is 21212223122353. The reversal of 21212223122311 is 11322132221212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212223122311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212223192311) 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, 815854735461 + ... + 815854735486.

It is an arithmetic number, because the mean of its divisors is an integer number (5710983148318).

Almost surely, 2^{21212223122311} is an apocalyptic number.

21212223122311 is a deficient number, since it is larger than the sum of its proper divisors (1631709470961).

21212223122311 is a wasteful number, since it uses less digits than its factorization.

21212223122311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631709470960.

The product of its digits is 1152, while the sum is 25.

Adding to 21212223122311 its reverse (11322132221212), we get a palindrome (32534355343523).

The spelling of 21212223122311 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-three million, one hundred twenty-two thousand, three hundred eleven".