20321029997453 has 2 divisors, whose sum is σ = 20321029997454. Its totient is φ = 20321029997452.

The previous prime is 20321029997447. The next prime is 20321029997479. The reversal of 20321029997453 is 35479992012302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17201150720329 + 3119879277124 = 4147427^2 + 1766318^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321029997453 - 2²² = 20321025803149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321029997413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160514998726 + 10160514998727.

It is an arithmetic number, because the mean of its divisors is an integer number (10160514998727).

Almost surely, 2^{20321029997453} is an apocalyptic number.

It is an amenable number.

20321029997453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321029997453 is an equidigital number, since it uses as much as digits as its factorization.

20321029997453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 56.

The spelling of 20321029997453 in words is "twenty trillion, three hundred twenty-one billion, twenty-nine million, nine hundred ninety-seven thousand, four hundred fifty-three".