21002222055 has 16 divisors (see below), whose sum is σ = 33817594464. Its totient is φ = 11129838720.

The previous prime is 21002222011. The next prime is 21002222089. The reversal of 21002222055 is 55022220012.

It is not a de Polignac number, because 21002222055 - 2²⁴ = 20985444839 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, 4456716 + ... + 4461425.

It is an arithmetic number, because the mean of its divisors is an integer number (2113599654).

Almost surely, 2^21002222055 is an apocalyptic number.

21002222055 is a deficient number, since it is larger than the sum of its proper divisors (12815372409).

21002222055 is a wasteful number, since it uses less digits than its factorization.

21002222055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8918306.

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 21002222055 its reverse (55022220012), we get a palindrome (76024442067).

The spelling of 21002222055 in words is "twenty-one billion, two million, two hundred twenty-two thousand, fifty-five".