21012212159 has 2 divisors, whose sum is σ = 21012212160. Its totient is φ = 21012212158.

The previous prime is 21012212153. The next prime is 21012212203. The reversal of 21012212159 is 95121221012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012212159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012212153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506106079 + 10506106080.

It is an arithmetic number, because the mean of its divisors is an integer number (10506106080).

Almost surely, 2^21012212159 is an apocalyptic number.

21012212159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012212159 is an equidigital number, since it uses as much as digits as its factorization.

21012212159 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 26.

The spelling of 21012212159 in words is "twenty-one billion, twelve million, two hundred twelve thousand, one hundred fifty-nine".