211421244 has 48 divisors (see below), whose sum is σ = 522063360. Its totient is φ = 66454080.

The previous prime is 211421237. The next prime is 211421251. The reversal of 211421244 is 442124112.

It is an interprime number because it is at equal distance from previous prime (211421237) and next prime (211421251).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 211421244.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14202 + ... + 24990.

It is an arithmetic number, because the mean of its divisors is an integer number (10876320).

Almost surely, 2^211421244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211421244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261031680).

211421244 is an abundant number, since it is smaller than the sum of its proper divisors (310642116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211421244 is a wasteful number, since it uses less digits than its factorization.

211421244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890 (or 10888 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 211421244 is about 14540.3316330818. The cubic root of 211421244 is about 595.7300963991.

Adding to 211421244 its reverse (442124112), we get a palindrome (653545356).

The spelling of 211421244 in words is "two hundred eleven million, four hundred twenty-one thousand, two hundred forty-four".