221621074 has 16 divisors (see below), whose sum is σ = 351216000. Its totient is φ = 104711824.

The previous prime is 221621063. The next prime is 221621087. The reversal of 221621074 is 470126122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37924 + ... + 43375.

It is an arithmetic number, because the mean of its divisors is an integer number (21951000).

Almost surely, 2^221621074 is an apocalyptic number.

221621074 is a deficient number, since it is larger than the sum of its proper divisors (129594926).

221621074 is a wasteful number, since it uses less digits than its factorization.

221621074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81377.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 221621074 is about 14886.9430710270. The cubic root of 221621074 is about 605.1601916267.

Adding to 221621074 its reverse (470126122), we get a palindrome (691747196).

The spelling of 221621074 in words is "two hundred twenty-one million, six hundred twenty-one thousand, seventy-four".