21535650442 has 8 divisors (see below), whose sum is σ = 32306143716. Its totient is φ = 10766935872.

The previous prime is 21535650413. The next prime is 21535650449. The reversal of 21535650442 is 24405653512.

It can be written as a sum of positive squares in 2 ways, for example, as 19309603681 + 2226046761 = 138959^2 + 47181^2 .

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 (21535650449) 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, 413983 + ... + 463090.

Almost surely, 2^21535650442 is an apocalyptic number.

21535650442 is a deficient number, since it is larger than the sum of its proper divisors (10770493274).

21535650442 is a wasteful number, since it uses less digits than its factorization.

21535650442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889352.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 21535650442 in words is "twenty-one billion, five hundred thirty-five million, six hundred fifty thousand, four hundred forty-two".