21042401633173 has 2 divisors, whose sum is σ = 21042401633174. Its totient is φ = 21042401633172.

The previous prime is 21042401633111. The next prime is 21042401633189. The reversal of 21042401633173 is 37133610424012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16336009819089 + 4706391814084 = 4041783^2 + 2169422^2 .

It is a cyclic number.

It is not a de Polignac number, because 21042401633173 - 2³⁷ = 20904962679701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21042401633873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521200816586 + 10521200816587.

It is an arithmetic number, because the mean of its divisors is an integer number (10521200816587).

Almost surely, 2^{21042401633173} is an apocalyptic number.

It is an amenable number.

21042401633173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042401633173 is an equidigital number, since it uses as much as digits as its factorization.

21042401633173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 21042401633173 in words is "twenty-one trillion, forty-two billion, four hundred one million, six hundred thirty-three thousand, one hundred seventy-three".