21401115559 has 2 divisors, whose sum is σ = 21401115560. Its totient is φ = 21401115558.

The previous prime is 21401115551. The next prime is 21401115581. The reversal of 21401115559 is 95551110412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21401115559 - 2³ = 21401115551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21401115551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700557779 + 10700557780.

It is an arithmetic number, because the mean of its divisors is an integer number (10700557780).

Almost surely, 2^21401115559 is an apocalyptic number.

21401115559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401115559 is an equidigital number, since it uses as much as digits as its factorization.

21401115559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 34.

The spelling of 21401115559 in words is "twenty-one billion, four hundred one million, one hundred fifteen thousand, five hundred fifty-nine".