21211352 has 8 divisors (see below), whose sum is σ = 39771300. Its totient is φ = 10605672.

The previous prime is 21211339. The next prime is 21211363. The reversal of 21211352 is 25311212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21211352.

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 as a sum of consecutive naturals, namely, 1325702 + ... + 1325717.

Almost surely, 2^21211352 is an apocalyptic number.

It is an amenable number.

21211352 is a deficient number, since it is larger than the sum of its proper divisors (18559948).

21211352 is a wasteful number, since it uses less digits than its factorization.

21211352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651425 (or 2651421 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 21211352 is about 4605.5783567322. The cubic root of 21211352 is about 276.8148919450.

Adding to 21211352 its reverse (25311212), we get a palindrome (46522564).

The spelling of 21211352 in words is "twenty-one million, two hundred eleven thousand, three hundred fifty-two".