21120202010923 has 2 divisors, whose sum is σ = 21120202010924. Its totient is φ = 21120202010922.

The previous prime is 21120202010893. The next prime is 21120202010989. The reversal of 21120202010923 is 32901020202112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120202010923 is a prime.

It is a super-2 number, since 2×21120202010923² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21120202010993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560101005461 + 10560101005462.

It is an arithmetic number, because the mean of its divisors is an integer number (10560101005462).

Almost surely, 2^{21120202010923} is an apocalyptic number.

21120202010923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120202010923 is an equidigital number, since it uses as much as digits as its factorization.

21120202010923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21120202010923 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, ten thousand, nine hundred twenty-three".