221251033 has 4 divisors (see below), whose sum is σ = 221401908. Its totient is φ = 221100160.

The previous prime is 221251031. The next prime is 221251081. The reversal of 221251033 is 330152122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158080329 + 63170704 = 12573^2 + 7948^2 .

It is a cyclic number.

It is not a de Polignac number, because 221251033 - 2¹ = 221251031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221251033.

It is not an unprimeable number, because it can be changed into a prime (221251031) 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, 73216 + ... + 76177.

It is an arithmetic number, because the mean of its divisors is an integer number (55350477).

Almost surely, 2^221251033 is an apocalyptic number.

It is an amenable number.

221251033 is a deficient number, since it is larger than the sum of its proper divisors (150875).

221251033 is a wasteful number, since it uses less digits than its factorization.

221251033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150874.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 221251033 is about 14874.5095045181. The cubic root of 221251033 is about 604.8231917369.

The spelling of 221251033 in words is "two hundred twenty-one million, two hundred fifty-one thousand, thirty-three".