221220111121151 has 2 divisors, whose sum is σ = 221220111121152. Its totient is φ = 221220111121150.

The previous prime is 221220111121069. The next prime is 221220111121169. The reversal of 221220111121151 is 151121111022122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221220111121151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220111141151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610055560575 + 110610055560576.

It is an arithmetic number, because the mean of its divisors is an integer number (110610055560576).

Almost surely, 2^{221220111121151} is an apocalyptic number.

221220111121151 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220111121151 is an equidigital number, since it uses as much as digits as its factorization.

221220111121151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 23.

Adding to 221220111121151 its reverse (151121111022122), we get a palindrome (372341222143273).

The spelling of 221220111121151 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-one thousand, one hundred fifty-one".