20451242215111 has 2 divisors, whose sum is σ = 20451242215112. Its totient is φ = 20451242215110.

The previous prime is 20451242215093. The next prime is 20451242215121. The reversal of 20451242215111 is 11151224215402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20451242215111 - 2³⁷ = 20313803261639 is a prime.

It is a super-2 number, since 2×20451242215111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451242215121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225621107555 + 10225621107556.

It is an arithmetic number, because the mean of its divisors is an integer number (10225621107556).

Almost surely, 2^{20451242215111} is an apocalyptic number.

20451242215111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451242215111 is an equidigital number, since it uses as much as digits as its factorization.

20451242215111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 31.

The spelling of 20451242215111 in words is "twenty trillion, four hundred fifty-one billion, two hundred forty-two million, two hundred fifteen thousand, one hundred eleven".