21455031040366 has 192 divisors, whose sum is σ = 41797344936960. Its totient is φ = 8164709280000.

The previous prime is 21455031040357. The next prime is 21455031040433. The reversal of 21455031040366 is 66304013055412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20413920541 + ... + 20413921591.

It is an arithmetic number, because the mean of its divisors is an integer number (217694504880).

Almost surely, 2^{21455031040366} is an apocalyptic number.

21455031040366 is a deficient number, since it is larger than the sum of its proper divisors (20342313896594).

21455031040366 is a wasteful number, since it uses less digits than its factorization.

21455031040366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391 (or 2384 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 21455031040366 its reverse (66304013055412), we get a palindrome (87759044095778).

The spelling of 21455031040366 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-one million, forty thousand, three hundred sixty-six".