21002223055 has 16 divisors (see below), whose sum is σ = 27498535200. Its totient is φ = 15271724160.

The previous prime is 21002223043. The next prime is 21002223061. The reversal of 21002223055 is 55032220012.

It is not a de Polignac number, because 21002223055 - 2⁹ = 21002222543 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326281 + ... + 385309.

It is an arithmetic number, because the mean of its divisors is an integer number (1718658450).

Almost surely, 2^21002223055 is an apocalyptic number.

21002223055 is a deficient number, since it is larger than the sum of its proper divisors (6496312145).

21002223055 is a wasteful number, since it uses less digits than its factorization.

21002223055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65514.

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 21002223055 its reverse (55032220012), we get a palindrome (76034443067).

The spelling of 21002223055 in words is "twenty-one billion, two million, two hundred twenty-three thousand, fifty-five".