21212223099 has 32 divisors (see below), whose sum is σ = 29517675264. Its totient is φ = 13537872000.

The previous prime is 21212223083. The next prime is 21212223113. The reversal of 21212223099 is 99032221212.

It is a happy number.

It is not a de Polignac number, because 21212223099 - 2⁴ = 21212223083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212223199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2307877 + ... + 2317049.

It is an arithmetic number, because the mean of its divisors is an integer number (922427352).

Almost surely, 2^21212223099 is an apocalyptic number.

21212223099 is a deficient number, since it is larger than the sum of its proper divisors (8305452165).

21212223099 is a wasteful number, since it uses less digits than its factorization.

21212223099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9547.

The product of its (nonzero) digits is 7776, while the sum is 33.

The spelling of 21212223099 in words is "twenty-one billion, two hundred twelve million, two hundred twenty-three thousand, ninety-nine".