221001212220011 has 4 divisors (see below), whose sum is σ = 221001341050800. Its totient is φ = 221001083389224.

The previous prime is 221001212219987. The next prime is 221001212220017. The reversal of 221001212220011 is 110022212100122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001212220011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001212220017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61807031 + ... + 65284848.

It is an arithmetic number, because the mean of its divisors is an integer number (55250335262700).

Almost surely, 2^{221001212220011} is an apocalyptic number.

221001212220011 is a deficient number, since it is larger than the sum of its proper divisors (128830789).

221001212220011 is a wasteful number, since it uses less digits than its factorization.

221001212220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128830788.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221001212220011 its reverse (110022212100122), we get a palindrome (331023424320133).

The spelling of 221001212220011 in words is "two hundred twenty-one trillion, one billion, two hundred twelve million, two hundred twenty thousand, eleven".