21020433442 has 8 divisors (see below), whose sum is σ = 31531377600. Its totient is φ = 10509974244.

The previous prime is 21020433437. The next prime is 21020433449. The reversal of 21020433442 is 24433402012.

It is a happy number.

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 (21020433449) 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, 20059 + ... + 206017.

It is an arithmetic number, because the mean of its divisors is an integer number (3941422200).

Almost surely, 2^21020433442 is an apocalyptic number.

21020433442 is a deficient number, since it is larger than the sum of its proper divisors (10510944158).

21020433442 is a wasteful number, since it uses less digits than its factorization.

21020433442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242480.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21020433442 its reverse (24433402012), we get a palindrome (45453835454).

The spelling of 21020433442 in words is "twenty-one billion, twenty million, four hundred thirty-three thousand, four hundred forty-two".