1221001110151 has 2 divisors, whose sum is σ = 1221001110152. Its totient is φ = 1221001110150.

The previous prime is 1221001110143. The next prime is 1221001110157. The reversal of 1221001110151 is 1510111001221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221001110151 - 2³ = 1221001110143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221001110157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500555075 + 610500555076.

It is an arithmetic number, because the mean of its divisors is an integer number (610500555076).

Almost surely, 2^{1221001110151} is an apocalyptic number.

1221001110151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221001110151 is an equidigital number, since it uses as much as digits as its factorization.

1221001110151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 1221001110151 its reverse (1510111001221), we get a palindrome (2731112111372).

The spelling of 1221001110151 in words is "one trillion, two hundred twenty-one billion, one million, one hundred ten thousand, one hundred fifty-one".