21420322442 has 8 divisors (see below), whose sum is σ = 32517598176. Its totient is φ = 10581123052.

The previous prime is 21420322321. The next prime is 21420322471. The reversal of 21420322442 is 24422302412.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64518878 + ... + 64519209.

It is an arithmetic number, because the mean of its divisors is an integer number (4064699772).

Almost surely, 2^21420322442 is an apocalyptic number.

21420322442 is a deficient number, since it is larger than the sum of its proper divisors (11097275734).

21420322442 is a wasteful number, since it uses less digits than its factorization.

21420322442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129038172.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21420322442 its reverse (24422302412), we get a palindrome (45842624854).

The spelling of 21420322442 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-two thousand, four hundred forty-two".