211233023021 has 4 divisors (see below), whose sum is σ = 211236061344. Its totient is φ = 211229984700.

The previous prime is 211233022961. The next prime is 211233023039. The reversal of 211233023021 is 120320332112.

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 a de Polignac number, because none of the positive numbers 2^k-211233023021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211233022984 and 211233023002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211233023081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412375 + ... + 1554756.

It is an arithmetic number, because the mean of its divisors is an integer number (52809015336).

Almost surely, 2^211233023021 is an apocalyptic number.

It is an amenable number.

211233023021 is a deficient number, since it is larger than the sum of its proper divisors (3038323).

211233023021 is an equidigital number, since it uses as much as digits as its factorization.

211233023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038322.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 211233023021 its reverse (120320332112), we get a palindrome (331553355133).

The spelling of 211233023021 in words is "two hundred eleven billion, two hundred thirty-three million, twenty-three thousand, twenty-one".