21220110099 has 12 divisors (see below), whose sum is σ = 30664964616. Its totient is φ = 14140419552.

The previous prime is 21220110089. The next prime is 21220110103. The reversal of 21220110099 is 99001102212.

It is not a de Polignac number, because 21220110099 - 2⁴ = 21220110083 is a prime.

It is a super-2 number, since 2×21220110099² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220110059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 505402 + ... + 545775.

It is an arithmetic number, because the mean of its divisors is an integer number (2555413718).

Almost surely, 2^21220110099 is an apocalyptic number.

21220110099 is a deficient number, since it is larger than the sum of its proper divisors (9444854517).

21220110099 is a wasteful number, since it uses less digits than its factorization.

21220110099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053426 (or 1053423 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21220110099 in words is "twenty-one billion, two hundred twenty million, one hundred ten thousand, ninety-nine".