211243223021 has 8 divisors (see below), whose sum is σ = 212290089984. Its totient is φ = 210197245680.

The previous prime is 211243222991. The next prime is 211243223033. The reversal of 211243223021 is 120322342112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211243223021 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 (211243223921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256220 + ... + 698666.

It is an arithmetic number, because the mean of its divisors is an integer number (26536261248).

Almost surely, 2^211243223021 is an apocalyptic number.

It is an amenable number.

211243223021 is a deficient number, since it is larger than the sum of its proper divisors (1046866963).

211243223021 is a wasteful number, since it uses less digits than its factorization.

211243223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444811.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 211243223021 its reverse (120322342112), we get a palindrome (331565565133).

The spelling of 211243223021 in words is "two hundred eleven billion, two hundred forty-three million, two hundred twenty-three thousand, twenty-one".