21111213214342 has 16 divisors (see below), whose sum is σ = 32896536077952. Its totient is φ = 10150038812160.

The previous prime is 21111213214307. The next prime is 21111213214349. The reversal of 21111213214342 is 24341231211112.

It is a self number, because there is not a number n which added to its sum of digits gives 21111213214342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111213214349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1084396123 + ... + 1084415590.

It is an arithmetic number, because the mean of its divisors is an integer number (2056033504872).

Almost surely, 2^{21111213214342} is an apocalyptic number.

21111213214342 is a deficient number, since it is larger than the sum of its proper divisors (11785322863610).

21111213214342 is a wasteful number, since it uses less digits than its factorization.

21111213214342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168811903.

The product of its digits is 2304, while the sum is 28.

Adding to 21111213214342 its reverse (24341231211112), we get a palindrome (45452444425454).

The spelling of 21111213214342 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirteen million, two hundred fourteen thousand, three hundred forty-two".