221002012 has 24 divisors (see below), whose sum is σ = 482186880. Its totient is φ = 86104560.

The previous prime is 221002003. The next prime is 221002021. The reversal of 221002012 is 210200122.

221002012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221002003) and next prime (221002021).

It is a self number, because there is not a number n which added to its sum of digits gives 221002012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358462 + ... + 359077.

It is an arithmetic number, because the mean of its divisors is an integer number (20091120).

Almost surely, 2^221002012 is an apocalyptic number.

221002012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221002012 is an abundant number, since it is smaller than the sum of its proper divisors (261184868).

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

221002012 is a wasteful number, since it uses less digits than its factorization.

221002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717561 (or 717559 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 221002012 is about 14866.1364180476. The cubic root of 221002012 is about 604.5961943526.

Adding to 221002012 its reverse (210200122), we get a palindrome (431202134).

The spelling of 221002012 in words is "two hundred twenty-one million, two thousand, twelve".