21111552107 has 2 divisors, whose sum is σ = 21111552108. Its totient is φ = 21111552106.

The previous prime is 21111552097. The next prime is 21111552151. The reversal of 21111552107 is 70125511112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111552107 is a prime.

It is a super-2 number, since 2×21111552107² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21111551107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555776053 + 10555776054.

It is an arithmetic number, because the mean of its divisors is an integer number (10555776054).

Almost surely, 2^21111552107 is an apocalyptic number.

21111552107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111552107 is an equidigital number, since it uses as much as digits as its factorization.

21111552107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 700, while the sum is 26.

The spelling of 21111552107 in words is "twenty-one billion, one hundred eleven million, five hundred fifty-two thousand, one hundred seven".