22428376821221 has 8 divisors (see below), whose sum is σ = 26459283254784. Its totient is φ = 18604183538160.

The previous prime is 22428376821167. The next prime is 22428376821223. The reversal of 22428376821221 is 12212867382422.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22428376821221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22428376821221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22428376821223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51678287390 + ... + 51678287823.

It is an arithmetic number, because the mean of its divisors is an integer number (3307410406848).

Almost surely, 2^{22428376821221} is an apocalyptic number.

It is an amenable number.

22428376821221 is a deficient number, since it is larger than the sum of its proper divisors (4030906433563).

22428376821221 is a wasteful number, since it uses less digits than its factorization.

22428376821221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103356575251.

The product of its digits is 2064384, while the sum is 50.

The spelling of 22428376821221 in words is "twenty-two trillion, four hundred twenty-eight billion, three hundred seventy-six million, eight hundred twenty-one thousand, two hundred twenty-one".