21111214142 has 32 divisors (see below), whose sum is σ = 34421980320. Its totient is φ = 9671326720.

The previous prime is 21111214141. The next prime is 21111214181. The reversal of 21111214142 is 24141211112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111214141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634784 + ... + 667212.

It is an arithmetic number, because the mean of its divisors is an integer number (1075686885).

Almost surely, 2^21111214142 is an apocalyptic number.

21111214142 is a deficient number, since it is larger than the sum of its proper divisors (13310766178).

21111214142 is a wasteful number, since it uses less digits than its factorization.

21111214142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32956.

The product of its digits is 128, while the sum is 20.

Adding to 21111214142 its reverse (24141211112), we get a palindrome (45252425254).

The spelling of 21111214142 in words is "twenty-one billion, one hundred eleven million, two hundred fourteen thousand, one hundred forty-two".