221836012 has 24 divisors (see below), whose sum is σ = 406580832. Its totient is φ = 105705600.

The previous prime is 221836003. The next prime is 221836019. The reversal of 221836012 is 210638122.

It is a super-2 number, since 2×221836012² = 98422432440128288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221836019) 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, 21562 + ... + 30142.

It is an arithmetic number, because the mean of its divisors is an integer number (16940868).

Almost surely, 2^221836012 is an apocalyptic number.

It is an amenable number.

221836012 is a deficient number, since it is larger than the sum of its proper divisors (184744820).

221836012 is a wasteful number, since it uses less digits than its factorization.

221836012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8889 (or 8887 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 221836012 is about 14894.1603321570. The cubic root of 221836012 is about 605.3557655279.

The spelling of 221836012 in words is "two hundred twenty-one million, eight hundred thirty-six thousand, twelve".