21010021210291 has 2 divisors, whose sum is σ = 21010021210292. Its totient is φ = 21010021210290.

The previous prime is 21010021210273. The next prime is 21010021210333. The reversal of 21010021210291 is 19201212001012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010021210291 - 2¹⁷ = 21010021079219 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010021210691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505010605145 + 10505010605146.

It is an arithmetic number, because the mean of its divisors is an integer number (10505010605146).

Almost surely, 2^{21010021210291} is an apocalyptic number.

21010021210291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010021210291 is an equidigital number, since it uses as much as digits as its factorization.

21010021210291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21010021210291 in words is "twenty-one trillion, ten billion, twenty-one million, two hundred ten thousand, two hundred ninety-one".