99998521111 has 2 divisors, whose sum is σ = 99998521112. Its totient is φ = 99998521110.

The previous prime is 99998521057. The next prime is 99998521141. The reversal of 99998521111 is 11112589999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99998521111 - 2¹¹ = 99998519063 is a prime.

It is a super-2 number, since 2×99998521111² (a number of 23 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99998521141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999260555 + 49999260556.

It is an arithmetic number, because the mean of its divisors is an integer number (49999260556).

Almost surely, 2^99998521111 is an apocalyptic number.

99998521111 is a deficient number, since it is larger than the sum of its proper divisors (1).

99998521111 is an equidigital number, since it uses as much as digits as its factorization.

99998521111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 55.

The spelling of 99998521111 in words is "ninety-nine billion, nine hundred ninety-eight million, five hundred twenty-one thousand, one hundred eleven".