21420223042 has 8 divisors (see below), whose sum is σ = 32132817936. Its totient is φ = 10709283732.

The previous prime is 21420223031. The next prime is 21420223067. The reversal of 21420223042 is 24032202412.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381028 + ... + 433615.

It is an arithmetic number, because the mean of its divisors is an integer number (4016602242).

Almost surely, 2^21420223042 is an apocalyptic number.

21420223042 is a deficient number, since it is larger than the sum of its proper divisors (10712594894).

21420223042 is a wasteful number, since it uses less digits than its factorization.

21420223042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827792.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21420223042 its reverse (24032202412), we get a palindrome (45452425454).

The spelling of 21420223042 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-three thousand, forty-two".