221202012 has 24 divisors (see below), whose sum is σ = 517143312. Its totient is φ = 73590400.

The previous prime is 221201999. The next prime is 221202013. The reversal of 221202012 is 210202122.

It is a super-2 number, since 2×221202012² = 97860660225696288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202013) 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, 11439 + ... + 23942.

It is an arithmetic number, because the mean of its divisors is an integer number (21547638).

Almost surely, 2^221202012 is an apocalyptic number.

It is an amenable number.

221202012 is an abundant number, since it is smaller than the sum of its proper divisors (295941300).

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

221202012 is a wasteful number, since it uses less digits than its factorization.

221202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35909 (or 35907 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221202012 is about 14872.8615941923. The cubic root of 221202012 is about 604.7785196628.

Adding to 221202012 its reverse (210202122), we get a palindrome (431404134).

The spelling of 221202012 in words is "two hundred twenty-one million, two hundred two thousand, twelve".