211221124023 has 32 divisors (see below), whose sum is σ = 348133004800. Its totient is φ = 110926786176.

The previous prime is 211221124019. The next prime is 211221124027. The reversal of 211221124023 is 320421122112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211221124019) and next prime (211221124027).

It is not a de Polignac number, because 211221124023 - 2² = 211221124019 is a prime.

It is a super-2 number, since 2×211221124023² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221124027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1626793 + ... + 1751826.

It is an arithmetic number, because the mean of its divisors is an integer number (10879156400).

Almost surely, 2^211221124023 is an apocalyptic number.

211221124023 is a deficient number, since it is larger than the sum of its proper divisors (136911880777).

211221124023 is a wasteful number, since it uses less digits than its factorization.

211221124023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378871.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 211221124023 its reverse (320421122112), we get a palindrome (531642246135).

The spelling of 211221124023 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred twenty-four thousand, twenty-three".