221210121120011 has 4 divisors (see below), whose sum is σ = 234222481185912. Its totient is φ = 208197761054112.

The previous prime is 221210121120007. The next prime is 221210121120059. The reversal of 221210121120011 is 110021121012122.

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

It is a cyclic number.

It is not a de Polignac number, because 221210121120011 - 2² = 221210121120007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 13012360065883 = 221210121120011 / (2 + 2 + 1 + 2 + 1 + 0 + 1 + 2 + 1 + 1 + 2 + 0 + 0 + 1 + 1).

It is not an unprimeable number, because it can be changed into a prime (251210121120011) 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, 6506180032925 + ... + 6506180032958.

It is an arithmetic number, because the mean of its divisors is an integer number (58555620296478).

Almost surely, 2^{221210121120011} is an apocalyptic number.

221210121120011 is a deficient number, since it is larger than the sum of its proper divisors (13012360065901).

221210121120011 is a wasteful number, since it uses less digits than its factorization.

221210121120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13012360065900.

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

Adding to 221210121120011 its reverse (110021121012122), we get a palindrome (331231242132133).

The spelling of 221210121120011 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred twenty-one million, one hundred twenty thousand, eleven".