211221043023 has 16 divisors (see below), whose sum is σ = 290916454400. Its totient is φ = 136176193440.

The previous prime is 211221043009. The next prime is 211221043073. The reversal of 211221043023 is 320340122112.

It is not a de Polignac number, because 211221043023 - 2¹² = 211221038927 is a prime.

It is a super-2 number, since 2×211221043023² (a number of 23 digits) contains 22 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 (211221043003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661783 + ... + 927576.

It is an arithmetic number, because the mean of its divisors is an integer number (18182278400).

Almost surely, 2^211221043023 is an apocalyptic number.

211221043023 is a deficient number, since it is larger than the sum of its proper divisors (79695411377).

211221043023 is a wasteful number, since it uses less digits than its factorization.

211221043023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590822.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 211221043023 its reverse (320340122112), we get a palindrome (531561165135).

The spelling of 211221043023 in words is "two hundred eleven billion, two hundred twenty-one million, forty-three thousand, twenty-three".