221291002 has 4 divisors (see below), whose sum is σ = 331936506. Its totient is φ = 110645500.

The previous prime is 221290991. The next prime is 221291003. The reversal of 221291002 is 200192122.

221291002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 187662601 + 33628401 = 13699^2 + 5799^2 .

It is not an unprimeable number, because it can be changed into a prime (221291003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55322749 + ... + 55322752.

Almost surely, 2^221291002 is an apocalyptic number.

221291002 is a deficient number, since it is larger than the sum of its proper divisors (110645504).

221291002 is a wasteful number, since it uses less digits than its factorization.

221291002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110645503.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 221291002 is about 14875.8529839468. The cubic root of 221291002 is about 604.8596099814.

The spelling of 221291002 in words is "two hundred twenty-one million, two hundred ninety-one thousand, two".