21212202223111 has 4 divisors (see below), whose sum is σ = 21559943243224. Its totient is φ = 20864461203000.

The previous prime is 21212202223081. The next prime is 21212202223123. The reversal of 21212202223111 is 11132220221212.

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 21212202223111 - 2¹³ = 21212202214919 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 (21212202223151) 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, 173870509965 + ... + 173870510086.

It is an arithmetic number, because the mean of its divisors is an integer number (5389985810806).

Almost surely, 2^{21212202223111} is an apocalyptic number.

21212202223111 is a deficient number, since it is larger than the sum of its proper divisors (347741020113).

21212202223111 is an equidigital number, since it uses as much as digits as its factorization.

21212202223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347741020112.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21212202223111 its reverse (11132220221212), we get a palindrome (32344422444323).

The spelling of 21212202223111 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, two hundred twenty-three thousand, one hundred eleven".