21313352 has 8 divisors (see below), whose sum is σ = 39962550. Its totient is φ = 10656672.

The previous prime is 21313349. The next prime is 21313361. The reversal of 21313352 is 25331312.

It can be written as a sum of positive squares in only one way, i.e., 20921476 + 391876 = 4574^2 + 626^2 .

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

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, 1332077 + ... + 1332092.

Almost surely, 2^21313352 is an apocalyptic number.

It is an amenable number.

21313352 is a deficient number, since it is larger than the sum of its proper divisors (18649198).

21313352 is a wasteful number, since it uses less digits than its factorization.

21313352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664175 (or 2664171 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 21313352 is about 4616.6386040062. The cubic root of 21313352 is about 277.2578934251.

Adding to 21313352 its reverse (25331312), we get a palindrome (46644664).

The spelling of 21313352 in words is "twenty-one million, three hundred thirteen thousand, three hundred fifty-two".