21120370 has 32 divisors (see below), whose sum is σ = 39004416. Its totient is φ = 8232000.

The previous prime is 21120367. The next prime is 21120383. The reversal of 21120370 is 7302112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107112 + ... + 107308.

It is an arithmetic number, because the mean of its divisors is an integer number (1218888).

Almost surely, 2^21120370 is an apocalyptic number.

21120370 is a deficient number, since it is larger than the sum of its proper divisors (17884046).

21120370 is a wasteful number, since it uses less digits than its factorization.

21120370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21120370 is about 4595.6903725121. The cubic root of 21120370 is about 276.4185433682.

Adding to 21120370 its reverse (7302112), we get a palindrome (28422482).

The spelling of 21120370 in words is "twenty-one million, one hundred twenty thousand, three hundred seventy".