21145450373 has 2 divisors, whose sum is σ = 21145450374. Its totient is φ = 21145450372.

The previous prime is 21145450349. The next prime is 21145450409. The reversal of 21145450373 is 37305454112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19842384769 + 1303065604 = 140863^2 + 36098^2 .

It is a cyclic number.

It is not a de Polignac number, because 21145450373 - 2²⁴ = 21128673157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145452373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572725186 + 10572725187.

It is an arithmetic number, because the mean of its divisors is an integer number (10572725187).

Almost surely, 2^21145450373 is an apocalyptic number.

It is an amenable number.

21145450373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145450373 is an equidigital number, since it uses as much as digits as its factorization.

21145450373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 21145450373 in words is "twenty-one billion, one hundred forty-five million, four hundred fifty thousand, three hundred seventy-three".