21016106442 has 48 divisors (see below), whose sum is σ = 46663049160. Its totient is φ = 6831936000.

The previous prime is 21016106351. The next prime is 21016106453. The reversal of 21016106442 is 24460161012.

21016106442 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 6 + 10 + 644 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21016010961 + 95481 = 144969^2 + 309^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3619942 + ... + 3625742.

Almost surely, 2^21016106442 is an apocalyptic number.

21016106442 is an abundant number, since it is smaller than the sum of its proper divisors (25646942718).

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

21016106442 is a wasteful number, since it uses less digits than its factorization.

21016106442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10759 (or 10756 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21016106442 its reverse (24460161012), we get a palindrome (45476267454).

The spelling of 21016106442 in words is "twenty-one billion, sixteen million, one hundred six thousand, four hundred forty-two".