21113515504111 has 2 divisors, whose sum is σ = 21113515504112. Its totient is φ = 21113515504110.

The previous prime is 21113515504091. The next prime is 21113515504117. The reversal of 21113515504111 is 11140551531112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113515504111 - 2²¹ = 21113513406959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113515504117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556757752055 + 10556757752056.

It is an arithmetic number, because the mean of its divisors is an integer number (10556757752056).

Almost surely, 2^{21113515504111} is an apocalyptic number.

21113515504111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113515504111 is an equidigital number, since it uses as much as digits as its factorization.

21113515504111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 31.

The spelling of 21113515504111 in words is "twenty-one trillion, one hundred thirteen billion, five hundred fifteen million, five hundred four thousand, one hundred eleven".