21011121059 has 2 divisors, whose sum is σ = 21011121060. Its totient is φ = 21011121058.

The previous prime is 21011121013. The next prime is 21011121073. The reversal of 21011121059 is 95012111012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011121059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011129059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505560529 + 10505560530.

It is an arithmetic number, because the mean of its divisors is an integer number (10505560530).

Almost surely, 2^21011121059 is an apocalyptic number.

21011121059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011121059 is an equidigital number, since it uses as much as digits as its factorization.

21011121059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 23.

The spelling of 21011121059 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, fifty-nine".