21242203213111 has 4 divisors (see below), whose sum is σ = 21243937141224. Its totient is φ = 21240469285000.

The previous prime is 21242203213069. The next prime is 21242203213157. The reversal of 21242203213111 is 11131230224212.

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 21242203213111 - 2¹⁵ = 21242203180343 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 (21242303213111) 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, 866945680 + ... + 866970181.

It is an arithmetic number, because the mean of its divisors is an integer number (5310984285306).

Almost surely, 2^{21242203213111} is an apocalyptic number.

21242203213111 is a deficient number, since it is larger than the sum of its proper divisors (1733928113).

21242203213111 is a wasteful number, since it uses less digits than its factorization.

21242203213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733928112.

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

Adding to 21242203213111 its reverse (11131230224212), we get a palindrome (32373433437323).

The spelling of 21242203213111 in words is "twenty-one trillion, two hundred forty-two billion, two hundred three million, two hundred thirteen thousand, one hundred eleven".