211453242021 has 24 divisors (see below), whose sum is σ = 349301519424. Its totient is φ = 120748783680.

The previous prime is 211453241999. The next prime is 211453242031. The reversal of 211453242021 is 120242354112.

211453242021 is a `hidden beast` number, since 2 + 1 + 1 + 453 + 2 + 4 + 202 + 1 = 666.

211453242021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211453242021 - 2⁷ = 211453241893 is a prime.

It is a super-2 number, since 2×211453242021² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211453242031) 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 23 ways as a sum of consecutive naturals, for example, 1039851 + ... + 1226456.

It is an arithmetic number, because the mean of its divisors is an integer number (14554229976).

Almost surely, 2^211453242021 is an apocalyptic number.

211453242021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211453242021 is a deficient number, since it is larger than the sum of its proper divisors (137848277403).

211453242021 is a wasteful number, since it uses less digits than its factorization.

211453242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267801 (or 2267798 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 211453242021 its reverse (120242354112), we get a palindrome (331695596133).

The spelling of 211453242021 in words is "two hundred eleven billion, four hundred fifty-three million, two hundred forty-two thousand, twenty-one".