212021112101 has 4 divisors (see below), whose sum is σ = 212041886304.
Its totient is φ = 212000337900.
The previous prime is 212021112071. The next prime is 212021112109. The reversal of 212021112101 is 101211120212.
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 212021112101 - 226 = 211954003237 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 (212021112109) 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, 10371785 + ... + 10392206.
It is an arithmetic number, because the mean of its divisors is an integer number (53010471576).
Almost surely, 2212021112101 is an apocalyptic number.
It is an amenable number.
212021112101 is a deficient number, since it is larger than the sum of its proper divisors (20774203).
212021112101 is a wasteful number, since it uses less digits than its factorization.
212021112101 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 20774202.
The product of its (nonzero) digits is 16, while the sum is 14.
Adding to 212021112101 its reverse (101211120212), we get a palindrome (313232232313).
It can be divided in two parts, 2120211 and 12101, that added together give a palindrome (2132312).
The spelling of 212021112101 in words is "two hundred twelve billion, twenty-one million, one hundred twelve thousand, one hundred one".