21370652 has 12 divisors (see below), whose sum is σ = 37784880. Its totient is φ = 10574976.

The previous prime is 21370639. The next prime is 21370667. The reversal of 21370652 is 25607312.

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 3 ways as a sum of consecutive naturals, for example, 27152 + ... + 27927.

It is an arithmetic number, because the mean of its divisors is an integer number (3148740).

Almost surely, 2^21370652 is an apocalyptic number.

It is an amenable number.

21370652 is a deficient number, since it is larger than the sum of its proper divisors (16414228).

21370652 is a wasteful number, since it uses less digits than its factorization.

21370652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55180 (or 55178 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21370652 is about 4622.8402524855. The cubic root of 21370652 is about 277.5061362710.

Adding to 21370652 its reverse (25607312), we get a palindrome (46977964).

It can be divided in two parts, 21370 and 652, that added together give a palindrome (22022).

The spelling of 21370652 in words is "twenty-one million, three hundred seventy thousand, six hundred fifty-two".