21010234442 has 8 divisors (see below), whose sum is σ = 32885584416. Its totient is φ = 10048372972.

The previous prime is 21010234433. The next prime is 21010234493. The reversal of 21010234442 is 24443201012.

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

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228372068 + ... + 228372159.

It is an arithmetic number, because the mean of its divisors is an integer number (4110698052).

Almost surely, 2^21010234442 is an apocalyptic number.

21010234442 is a deficient number, since it is larger than the sum of its proper divisors (11875349974).

21010234442 is a wasteful number, since it uses less digits than its factorization.

21010234442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456744252.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21010234442 its reverse (24443201012), we get a palindrome (45453435454).

The spelling of 21010234442 in words is "twenty-one billion, ten million, two hundred thirty-four thousand, four hundred forty-two".