21122021210109 has 16 divisors (see below), whose sum is σ = 28264838553600. Its totient is φ = 14030362016496.

The previous prime is 21122021210063. The next prime is 21122021210111. The reversal of 21122021210109 is 90101212022112.

It is not a de Polignac number, because 21122021210109 - 2³² = 21117726242813 is a prime.

It is a super-2 number, since 2×21122021210109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021210909) 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, 9814189 + ... + 11771250.

It is an arithmetic number, because the mean of its divisors is an integer number (1766552409600).

Almost surely, 2^{21122021210109} is an apocalyptic number.

It is an amenable number.

21122021210109 is a deficient number, since it is larger than the sum of its proper divisors (7142817343491).

21122021210109 is a wasteful number, since it uses less digits than its factorization.

21122021210109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21586624.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21122021210109 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred ten thousand, one hundred nine".