21950210 has 16 divisors (see below), whose sum is σ = 40430016. Its totient is φ = 8575728.

The previous prime is 21950209. The next prime is 21950221. The reversal of 21950210 is 1205912.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25094 + ... + 25953.

It is an arithmetic number, because the mean of its divisors is an integer number (2526876).

Almost surely, 2^21950210 is an apocalyptic number.

21950210 is a deficient number, since it is larger than the sum of its proper divisors (18479806).

21950210 is a wasteful number, since it uses less digits than its factorization.

21950210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51097.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21950210 is about 4685.1051215528. The cubic root of 21950210 is about 279.9923892489.

The spelling of 21950210 in words is "twenty-one million, nine hundred fifty thousand, two hundred ten".