211140421021 has 4 divisors (see below), whose sum is σ = 211142120544. Its totient is φ = 211138721500.

The previous prime is 211140420983. The next prime is 211140421027. The reversal of 211140421021 is 120124041112.

It is a happy number.

211140421021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211140421021 - 2⁷ = 211140420893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211140421021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211140421027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647335 + ... + 917236.

It is an arithmetic number, because the mean of its divisors is an integer number (52785530136).

Almost surely, 2^211140421021 is an apocalyptic number.

It is an amenable number.

211140421021 is a deficient number, since it is larger than the sum of its proper divisors (1699523).

211140421021 is a wasteful number, since it uses less digits than its factorization.

211140421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699522.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211140421021 its reverse (120124041112), we get a palindrome (331264462133).

The spelling of 211140421021 in words is "two hundred eleven billion, one hundred forty million, four hundred twenty-one thousand, twenty-one".