21023030239997 has 2 divisors, whose sum is σ = 21023030239998. Its totient is φ = 21023030239996.

The previous prime is 21023030239963. The next prime is 21023030240021. The reversal of 21023030239997 is 79993203032012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13602015224281 + 7421015015716 = 3688091^2 + 2724154^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023030239997 - 2²⁰ = 21023029191421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023030239907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511515119998 + 10511515119999.

It is an arithmetic number, because the mean of its divisors is an integer number (10511515119999).

Almost surely, 2^{21023030239997} is an apocalyptic number.

It is an amenable number.

21023030239997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023030239997 is an equidigital number, since it uses as much as digits as its factorization.

21023030239997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The spelling of 21023030239997 in words is "twenty-one trillion, twenty-three billion, thirty million, two hundred thirty-nine thousand, nine hundred ninety-seven".