21941205 has 64 divisors (see below), whose sum is σ = 42239232. Its totient is φ = 9584640.

The previous prime is 21941189. The next prime is 21941207. The reversal of 21941205 is 50214912.

It is not a de Polignac number, because 21941205 - 2⁴ = 21941189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941207) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113589 + ... + 113781.

It is an arithmetic number, because the mean of its divisors is an integer number (659988).

Almost surely, 2^21941205 is an apocalyptic number.

It is an amenable number.

21941205 is a deficient number, since it is larger than the sum of its proper divisors (20298027).

21941205 is a wasteful number, since it uses less digits than its factorization.

21941205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21941205 is about 4684.1439986405. The cubic root of 21941205 is about 279.9540953657.

The spelling of 21941205 in words is "twenty-one million, nine hundred forty-one thousand, two hundred five".