21220594 has 8 divisors (see below), whose sum is σ = 32508288. Its totient is φ = 10384500.

The previous prime is 21220583. The next prime is 21220597. The reversal of 21220594 is 49502212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21220597) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 112782 + ... + 112969.

It is an arithmetic number, because the mean of its divisors is an integer number (4063536).

Almost surely, 2^21220594 is an apocalyptic number.

21220594 is a deficient number, since it is larger than the sum of its proper divisors (11287694).

21220594 is a wasteful number, since it uses less digits than its factorization.

21220594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225800.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21220594 is about 4606.5815959342. The cubic root of 21220594 is about 276.8550897874.

The spelling of 21220594 in words is "twenty-one million, two hundred twenty thousand, five hundred ninety-four".