221202112121011 has 16 divisors (see below), whose sum is σ = 256354580285440. Its totient is φ = 186944288113440.

The previous prime is 221202112120987. The next prime is 221202112121057. The reversal of 221202112121011 is 110121211202122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221202112121011 - 2²⁹ = 221201575250099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221202112121011.

It is not an unprimeable number, because it can be changed into a prime (221202112125011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274703760 + ... + 275507821.

It is an arithmetic number, because the mean of its divisors is an integer number (16022161267840).

Almost surely, 2^{221202112121011} is an apocalyptic number.

221202112121011 is a deficient number, since it is larger than the sum of its proper divisors (35152468164429).

221202112121011 is an equidigital number, since it uses as much as digits as its factorization.

221202112121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550212394.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221202112121011 its reverse (110121211202122), we get a palindrome (331323323323133).

The spelling of 221202112121011 in words is "two hundred twenty-one trillion, two hundred two billion, one hundred twelve million, one hundred twenty-one thousand, eleven".