222545021 has 4 divisors (see below), whose sum is σ = 224297472. Its totient is φ = 220792572.

The previous prime is 222545003. The next prime is 222545051. The reversal of 222545021 is 120545222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222545021 - 2¹⁴ = 222528637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222545051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876035 + ... + 876288.

It is an arithmetic number, because the mean of its divisors is an integer number (56074368).

Almost surely, 2^222545021 is an apocalyptic number.

It is an amenable number.

222545021 is a deficient number, since it is larger than the sum of its proper divisors (1752451).

222545021 is a wasteful number, since it uses less digits than its factorization.

222545021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752450.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 222545021 is about 14917.9429211939. The cubic root of 222545021 is about 606.0000045384. Note that the first 5 decimals are identical.

The spelling of 222545021 in words is "two hundred twenty-two million, five hundred forty-five thousand, twenty-one".