21133030442 has 8 divisors (see below), whose sum is σ = 32219210532. Its totient is φ = 10393293600.

The previous prime is 21133030441. The next prime is 21133030487. The reversal of 21133030442 is 24403033112.

It can be written as a sum of positive squares in 2 ways, for example, as 19168679401 + 1964351041 = 138451^2 + 44321^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21133030441) 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, 86610659 + ... + 86610902.

Almost surely, 2^21133030442 is an apocalyptic number.

21133030442 is a deficient number, since it is larger than the sum of its proper divisors (11086180090).

21133030442 is a wasteful number, since it uses less digits than its factorization.

21133030442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173221624.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21133030442 its reverse (24403033112), we get a palindrome (45536063554).

The spelling of 21133030442 in words is "twenty-one billion, one hundred thirty-three million, thirty thousand, four hundred forty-two".