221001212111012 has 6 divisors (see below), whose sum is σ = 386752121194278. Its totient is φ = 110500606055504.

The previous prime is 221001212110997. The next prime is 221001212111023. The reversal of 221001212111012 is 210111212100122.

It can be written as a sum of positive squares in only one way, i.e., 209461766166436 + 11539445944576 = 14472794^2 + 3396976^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27625151513873 + ... + 27625151513880.

It is an arithmetic number, because the mean of its divisors is an integer number (64458686865713).

Almost surely, 2^{221001212111012} is an apocalyptic number.

It is an amenable number.

221001212111012 is a deficient number, since it is larger than the sum of its proper divisors (165750909083266).

221001212111012 is a wasteful number, since it uses less digits than its factorization.

221001212111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55250303027757 (or 55250303027755 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221001212111012 its reverse (210111212100122), we get a palindrome (431112424211134).

The spelling of 221001212111012 in words is "two hundred twenty-one trillion, one billion, two hundred twelve million, one hundred eleven thousand, twelve".