21012001259 has 2 divisors, whose sum is σ = 21012001260. Its totient is φ = 21012001258.

The previous prime is 21012001237. The next prime is 21012001273. The reversal of 21012001259 is 95210021012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012001259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012001459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506000629 + 10506000630.

It is an arithmetic number, because the mean of its divisors is an integer number (10506000630).

Almost surely, 2^21012001259 is an apocalyptic number.

21012001259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012001259 is an equidigital number, since it uses as much as digits as its factorization.

21012001259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 21012001259 in words is "twenty-one billion, twelve million, one thousand, two hundred fifty-nine".