21111244042 has 32 divisors (see below), whose sum is σ = 36668903040. Its totient is φ = 8928792000.

The previous prime is 21111244003. The next prime is 21111244061. The reversal of 21111244042 is 24044211112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355468 + ... + 410584.

It is an arithmetic number, because the mean of its divisors is an integer number (1145903220).

Almost surely, 2^21111244042 is an apocalyptic number.

21111244042 is a deficient number, since it is larger than the sum of its proper divisors (15557658998).

21111244042 is a wasteful number, since it uses less digits than its factorization.

21111244042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55486.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21111244042 its reverse (24044211112), we get a palindrome (45155455154).

The spelling of 21111244042 in words is "twenty-one billion, one hundred eleven million, two hundred forty-four thousand, forty-two".