20421121265119 has 2 divisors, whose sum is σ = 20421121265120. Its totient is φ = 20421121265118.

The previous prime is 20421121265113. The next prime is 20421121265123. The reversal of 20421121265119 is 91156212112402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20421121265119 - 2¹⁷ = 20421121134047 is a prime.

It is a super-2 number, since 2×20421121265119² (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 (20421121265113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210560632559 + 10210560632560.

It is an arithmetic number, because the mean of its divisors is an integer number (10210560632560).

Almost surely, 2^{20421121265119} is an apocalyptic number.

20421121265119 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421121265119 is an equidigital number, since it uses as much as digits as its factorization.

20421121265119 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 20421121265119 in words is "twenty trillion, four hundred twenty-one billion, one hundred twenty-one million, two hundred sixty-five thousand, one hundred nineteen".