21223531055 has 8 divisors (see below), whose sum is σ = 25582445952. Its totient is φ = 16902685728.

The previous prime is 21223531003. The next prime is 21223531073. The reversal of 21223531055 is 55013532212.

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 21223531055 - 2²² = 21219336751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9516164 + ... + 9518393.

It is an arithmetic number, because the mean of its divisors is an integer number (3197805744).

Almost surely, 2^21223531055 is an apocalyptic number.

21223531055 is a deficient number, since it is larger than the sum of its proper divisors (4358914897).

21223531055 is a wasteful number, since it uses less digits than its factorization.

21223531055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19034785.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 21223531055 in words is "twenty-one billion, two hundred twenty-three million, five hundred thirty-one thousand, fifty-five".