21151145567 has 2 divisors, whose sum is σ = 21151145568. Its totient is φ = 21151145566.

The previous prime is 21151145443. The next prime is 21151145579. The reversal of 21151145567 is 76554115112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21151145567 - 2⁸ = 21151145311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21151145567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21151145167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575572783 + 10575572784.

It is an arithmetic number, because the mean of its divisors is an integer number (10575572784).

Almost surely, 2^21151145567 is an apocalyptic number.

21151145567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21151145567 is an equidigital number, since it uses as much as digits as its factorization.

21151145567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 38.

The spelling of 21151145567 in words is "twenty-one billion, one hundred fifty-one million, one hundred forty-five thousand, five hundred sixty-seven".