21954355 has 16 divisors (see below), whose sum is σ = 27417600. Its totient is φ = 16858080.

The previous prime is 21954341. The next prime is 21954391. The reversal of 21954355 is 55345912.

It is not a de Polignac number, because 21954355 - 2⁵ = 21954323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21954355.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21036 + ... + 22054.

It is an arithmetic number, because the mean of its divisors is an integer number (1713600).

Almost surely, 2^21954355 is an apocalyptic number.

21954355 is a deficient number, since it is larger than the sum of its proper divisors (5463245).

21954355 is a wasteful number, since it uses less digits than its factorization.

21954355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194.

The product of its digits is 27000, while the sum is 34.

The square root of 21954355 is about 4685.5474600093. The cubic root of 21954355 is about 280.0100123971.

The spelling of 21954355 in words is "twenty-one million, nine hundred fifty-four thousand, three hundred fifty-five".