221020012 has 24 divisors (see below), whose sum is σ = 397760832. Its totient is φ = 107395200.

The previous prime is 221020003. The next prime is 221020039. The reversal of 221020012 is 210020122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41958 + ... + 46930.

It is an arithmetic number, because the mean of its divisors is an integer number (16573368).

Almost surely, 2^221020012 is an apocalyptic number.

It is an amenable number.

221020012 is a deficient number, since it is larger than the sum of its proper divisors (176740820).

221020012 is a wasteful number, since it uses less digits than its factorization.

221020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5289 (or 5287 counting only the distinct ones).

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

The square root of 221020012 is about 14866.7418084798. The cubic root of 221020012 is about 604.6126081339.

Adding to 221020012 its reverse (210020122), we get a palindrome (431040134).

It can be divided in two parts, 2210 and 20012, that added together give a palindrome (22222).

The spelling of 221020012 in words is "two hundred twenty-one million, twenty thousand, twelve".