21850195 has 16 divisors (see below), whose sum is σ = 28005120. Its totient is φ = 16329600.

The previous prime is 21850193. The next prime is 21850259. The reversal of 21850195 is 59105812.

It is not a de Polignac number, because 21850195 - 2¹ = 21850193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (21850193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2065 + ... + 6925.

It is an arithmetic number, because the mean of its divisors is an integer number (1750320).

Almost surely, 2^21850195 is an apocalyptic number.

21850195 is a deficient number, since it is larger than the sum of its proper divisors (6154925).

21850195 is a wasteful number, since it uses less digits than its factorization.

21850195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 21850195 is about 4674.4192152609. The cubic root of 21850195 is about 279.5664847606.

The spelling of 21850195 in words is "twenty-one million, eight hundred fifty thousand, one hundred ninety-five".