212021091101 has 4 divisors (see below), whose sum is σ = 212122684512. Its totient is φ = 211919497692.

The previous prime is 212021091089. The next prime is 212021091109. The reversal of 212021091101 is 101190120212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212021091101 - 2¹⁰ = 212021090077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021091109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50793575 + ... + 50797748.

It is an arithmetic number, because the mean of its divisors is an integer number (53030671128).

Almost surely, 2^212021091101 is an apocalyptic number.

It is an amenable number.

212021091101 is a deficient number, since it is larger than the sum of its proper divisors (101593411).

212021091101 is a wasteful number, since it uses less digits than its factorization.

212021091101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101593410.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 212021091101 in words is "two hundred twelve billion, twenty-one million, ninety-one thousand, one hundred one".