211223230431021 has 12 divisors (see below), whose sum is σ = 305101316497120. Its totient is φ = 140814981678600.

The previous prime is 211223230430999. The next prime is 211223230431029. The reversal of 211223230431021 is 120134032322112.

211223230431021 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 2 + 323 + 0 + 4 + 310 + 21 = 666.

It is not a de Polignac number, because 211223230431021 - 2⁷ = 211223230430893 is a prime.

It is a super-3 number, since 3×211223230431021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223230431029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39449905 + ... + 44483046.

Almost surely, 2^{211223230431021} is an apocalyptic number.

It is an amenable number.

211223230431021 is a deficient number, since it is larger than the sum of its proper divisors (93878086066099).

211223230431021 is a wasteful number, since it uses less digits than its factorization.

211223230431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84212576 (or 84212573 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 211223230431021 its reverse (120134032322112), we get a palindrome (331357262753133).

The spelling of 211223230431021 in words is "two hundred eleven trillion, two hundred twenty-three billion, two hundred thirty million, four hundred thirty-one thousand, twenty-one".