21525455111 has 2 divisors, whose sum is σ = 21525455112. Its totient is φ = 21525455110.

The previous prime is 21525455101. The next prime is 21525455113. The reversal of 21525455111 is 11155452512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21525455111 - 2³⁴ = 4345585927 is a prime.

Together with 21525455113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21525455113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762727555 + 10762727556.

It is an arithmetic number, because the mean of its divisors is an integer number (10762727556).

Almost surely, 2^21525455111 is an apocalyptic number.

21525455111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525455111 is an equidigital number, since it uses as much as digits as its factorization.

21525455111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10000, while the sum is 32.

The spelling of 21525455111 in words is "twenty-one billion, five hundred twenty-five million, four hundred fifty-five thousand, one hundred eleven".