221253066 has 16 divisors (see below), whose sum is σ = 491673600. Its totient is φ = 73751004.

The previous prime is 221253061. The next prime is 221253073. The reversal of 221253066 is 660352122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221253061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2048586 + ... + 2048693.

It is an arithmetic number, because the mean of its divisors is an integer number (30729600).

Almost surely, 2^221253066 is an apocalyptic number.

221253066 is an abundant number, since it is smaller than the sum of its proper divisors (270420534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221253066 is a wasteful number, since it uses less digits than its factorization.

221253066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097290 (or 4097284 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 221253066 is about 14874.5778427490. The cubic root of 221253066 is about 604.8250442357.

It can be divided in two parts, 2212 and 53066, that added together give a triangular number (55278 = T₃₃₂).

The spelling of 221253066 in words is "two hundred twenty-one million, two hundred fifty-three thousand, sixty-six".