21111411042 has 24 divisors (see below), whose sum is σ = 45766042140. Its totient is φ = 7033344480.

The previous prime is 21111411023. The next prime is 21111411059. The reversal of 21111411042 is 24011411112.

21111411042 is a `hidden beast` number, since 211 + 1 + 1 + 411 + 0 + 42 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13007630601 + 8103780441 = 114051^2 + 90021^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 281617 + ... + 348612.

Almost surely, 2^21111411042 is an apocalyptic number.

21111411042 is an abundant number, since it is smaller than the sum of its proper divisors (24654631098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111411042 is a wasteful number, since it uses less digits than its factorization.

21111411042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632098 (or 632095 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21111411042 its reverse (24011411112), we get a palindrome (45122822154).

The spelling of 21111411042 in words is "twenty-one billion, one hundred eleven million, four hundred eleven thousand, forty-two".