221627021 has 16 divisors (see below), whose sum is σ = 278315520. Its totient is φ = 171445680.

The previous prime is 221626991. The next prime is 221627033. The reversal of 221627021 is 120726122.

It is a happy number.

221627021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221627021 - 2⁶ = 221626957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221627221) 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, 350 + ... + 21056.

It is an arithmetic number, because the mean of its divisors is an integer number (17394720).

Almost surely, 2^221627021 is an apocalyptic number.

It is an amenable number.

221627021 is a deficient number, since it is larger than the sum of its proper divisors (56688499).

221627021 is a wasteful number, since it uses less digits than its factorization.

221627021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20864.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 221627021 is about 14887.1428084774. The cubic root of 221627021 is about 605.1656045528.

The spelling of 221627021 in words is "two hundred twenty-one million, six hundred twenty-seven thousand, twenty-one".