21955750 has 32 divisors (see below), whose sum is σ = 42441984. Its totient is φ = 8496000.

The previous prime is 21955733. The next prime is 21955753. The reversal of 21955750 is 5755912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21955753) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6334 + ... + 9166.

It is an arithmetic number, because the mean of its divisors is an integer number (1326312).

Almost surely, 2^21955750 is an apocalyptic number.

21955750 is a deficient number, since it is larger than the sum of its proper divisors (20486234).

21955750 is a wasteful number, since it uses less digits than its factorization.

21955750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881 (or 2871 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 21955750 is about 4685.6963196520. The cubic root of 21955750 is about 280.0159429698.

The spelling of 21955750 in words is "twenty-one million, nine hundred fifty-five thousand, seven hundred fifty".