21012221059 has 2 divisors, whose sum is σ = 21012221060. Its totient is φ = 21012221058.

The previous prime is 21012221057. The next prime is 21012221171. The reversal of 21012221059 is 95012221012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012221059 - 2¹ = 21012221057 is a prime.

Together with 21012221057, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21012221057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506110529 + 10506110530.

It is an arithmetic number, because the mean of its divisors is an integer number (10506110530).

Almost surely, 2^21012221059 is an apocalyptic number.

21012221059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012221059 is an equidigital number, since it uses as much as digits as its factorization.

21012221059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 21012221059 in words is "twenty-one billion, twelve million, two hundred twenty-one thousand, fifty-nine".