21210012010939 has 2 divisors, whose sum is σ = 21210012010940. Its totient is φ = 21210012010938.

The previous prime is 21210012010927. The next prime is 21210012011047. The reversal of 21210012010939 is 93901021001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210012010939 - 2⁵ = 21210012010907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210012010939.

It is not a weakly prime, because it can be changed into another prime (21210012050939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605006005469 + 10605006005470.

It is an arithmetic number, because the mean of its divisors is an integer number (10605006005470).

Almost surely, 2^{21210012010939} is an apocalyptic number.

21210012010939 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210012010939 is an equidigital number, since it uses as much as digits as its factorization.

21210012010939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21210012010939 in words is "twenty-one trillion, two hundred ten billion, twelve million, ten thousand, nine hundred thirty-nine".