21112012221142 has 8 divisors (see below), whose sum is σ = 32341805955936. Its totient is φ = 10331410235832.

The previous prime is 21112012221073. The next prime is 21112012221143. The reversal of 21112012221142 is 24112221021112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112012221143) 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, 112297937253 + ... + 112297937440.

It is an arithmetic number, because the mean of its divisors is an integer number (4042725744492).

Almost surely, 2^{21112012221142} is an apocalyptic number.

21112012221142 is a deficient number, since it is larger than the sum of its proper divisors (11229793734794).

21112012221142 is a wasteful number, since it uses less digits than its factorization.

21112012221142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224595874742.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 21112012221142 its reverse (24112221021112), we get a palindrome (45224233242254).

The spelling of 21112012221142 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-one thousand, one hundred forty-two".