21422543655 has 8 divisors (see below), whose sum is σ = 34276069872. Its totient is φ = 11425356608.

The previous prime is 21422543651. The next prime is 21422543663. The reversal of 21422543655 is 55634522412.

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

It is a cyclic number.

It is not a de Polignac number, because 21422543655 - 2² = 21422543651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422543651) 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, 714084774 + ... + 714084803.

It is an arithmetic number, because the mean of its divisors is an integer number (4284508734).

Almost surely, 2^21422543655 is an apocalyptic number.

21422543655 is a deficient number, since it is larger than the sum of its proper divisors (12853526217).

21422543655 is a wasteful number, since it uses less digits than its factorization.

21422543655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428169585.

The product of its digits is 288000, while the sum is 39.

The spelling of 21422543655 in words is "twenty-one billion, four hundred twenty-two million, five hundred forty-three thousand, six hundred fifty-five".