21370650 has 48 divisors (see below), whose sum is σ = 60573504. Its totient is φ = 4884480.

The previous prime is 21370639. The next prime is 21370667. The reversal of 21370650 is 5607312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21370650.

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 23 ways as a sum of consecutive naturals, for example, 9127 + ... + 11226.

It is an arithmetic number, because the mean of its divisors is an integer number (1261948).

Almost surely, 2^21370650 is an apocalyptic number.

21370650 is an abundant number, since it is smaller than the sum of its proper divisors (39202854).

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

21370650 is a wasteful number, since it uses less digits than its factorization.

21370650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20375 (or 20370 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 21370650 is about 4622.8400361682. The cubic root of 21370650 is about 277.5061276141.

Adding to 21370650 its reverse (5607312), we get a palindrome (26977962).

The spelling of 21370650 in words is "twenty-one million, three hundred seventy thousand, six hundred fifty".