21250641434506 has 64 divisors (see below), whose sum is σ = 35187080400000. Its totient is φ = 9545367838720.

The previous prime is 21250641434501. The next prime is 21250641434507. The reversal of 21250641434506 is 60543414605212.

It is a super-2 number, since 2×21250641434506² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21250641434501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510701430 + ... + 510743038.

It is an arithmetic number, because the mean of its divisors is an integer number (549798131250).

Almost surely, 2^{21250641434506} is an apocalyptic number.

21250641434506 is a deficient number, since it is larger than the sum of its proper divisors (13936438965494).

21250641434506 is a wasteful number, since it uses less digits than its factorization.

21250641434506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42567.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 21250641434506 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred thirty-four thousand, five hundred six".