21428608342 has 8 divisors (see below), whose sum is σ = 32150558232. Its totient is φ = 10711755600.

The previous prime is 21428608337. The next prime is 21428608373. The reversal of 21428608342 is 24380682412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21428608295 and 21428608304.

It is a congruent number.

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, 1263759 + ... + 1280602.

It is an arithmetic number, because the mean of its divisors is an integer number (4018819779).

Almost surely, 2^21428608342 is an apocalyptic number.

21428608342 is a deficient number, since it is larger than the sum of its proper divisors (10721949890).

21428608342 is a wasteful number, since it uses less digits than its factorization.

21428608342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548574.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 21428608342 in words is "twenty-one billion, four hundred twenty-eight million, six hundred eight thousand, three hundred forty-two".