21121319599 has 2 divisors, whose sum is σ = 21121319600. Its totient is φ = 21121319598.

The previous prime is 21121319591. The next prime is 21121319603. The reversal of 21121319599 is 99591312112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121319599 - 2³ = 21121319591 is a prime.

It is a super-2 number, since 2×21121319599² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121319591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560659799 + 10560659800.

It is an arithmetic number, because the mean of its divisors is an integer number (10560659800).

Almost surely, 2^21121319599 is an apocalyptic number.

21121319599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121319599 is an equidigital number, since it uses as much as digits as its factorization.

21121319599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 43.

The spelling of 21121319599 in words is "twenty-one billion, one hundred twenty-one million, three hundred nineteen thousand, five hundred ninety-nine".