20021210099 has 16 divisors (see below), whose sum is σ = 22208099424. Its totient is φ = 17895686400.

The previous prime is 20021210087. The next prime is 20021210147. The reversal of 20021210099 is 99001212002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20021210099 - 2⁸ = 20021209843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021210059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2500847 + ... + 2508839.

It is an arithmetic number, because the mean of its divisors is an integer number (1388006214).

Almost surely, 2^20021210099 is an apocalyptic number.

20021210099 is a deficient number, since it is larger than the sum of its proper divisors (2186889325).

20021210099 is a wasteful number, since it uses less digits than its factorization.

20021210099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11798.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 20021210099 in words is "twenty billion, twenty-one million, two hundred ten thousand, ninety-nine".