21101222012109 has 16 divisors (see below), whose sum is σ = 28305573007488. Its totient is φ = 13982188902912.

The previous prime is 21101222012099. The next prime is 21101222012113. The reversal of 21101222012109 is 90121022210112.

It is not a de Polignac number, because 21101222012109 - 2⁴¹ = 18902198756557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101222012179) 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, 5078049 + ... + 8245545.

It is an arithmetic number, because the mean of its divisors is an integer number (1769098312968).

Almost surely, 2^{21101222012109} is an apocalyptic number.

It is an amenable number.

21101222012109 is a deficient number, since it is larger than the sum of its proper divisors (7204350995379).

21101222012109 is a wasteful number, since it uses less digits than its factorization.

21101222012109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180964.

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

The spelling of 21101222012109 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, twelve thousand, one hundred nine".