21455104215250 has 64 divisors (see below), whose sum is σ = 40261203290880. Its totient is φ = 8561267836800.

The previous prime is 21455104215227. The next prime is 21455104215253. The reversal of 21455104215250 is 5251240155412.

It is not an unprimeable number, because it can be changed into a prime (21455104215253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1526286222 + ... + 1526300278.

It is an arithmetic number, because the mean of its divisors is an integer number (629081301420).

Almost surely, 2^{21455104215250} is an apocalyptic number.

21455104215250 is a deficient number, since it is larger than the sum of its proper divisors (18806099075630).

21455104215250 is a wasteful number, since it uses less digits than its factorization.

21455104215250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28420 (or 28410 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 37.

The spelling of 21455104215250 in words is "twenty-one trillion, four hundred fifty-five billion, one hundred four million, two hundred fifteen thousand, two hundred fifty".