21250416434506 has 32 divisors (see below), whose sum is σ = 37318320829440. Its totient is φ = 8885068598400.

The previous prime is 21250416434497. The next prime is 21250416434537. The reversal of 21250416434506 is 60543461405212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49766160 + ... + 50191348.

It is an arithmetic number, because the mean of its divisors is an integer number (1166197525920).

Almost surely, 2^{21250416434506} is an apocalyptic number.

21250416434506 is a deficient number, since it is larger than the sum of its proper divisors (16067904394934).

21250416434506 is a wasteful number, since it uses less digits than its factorization.

21250416434506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512310.

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

Adding to 21250416434506 its reverse (60543461405212), we get a palindrome (81793877839718).

The spelling of 21250416434506 in words is "twenty-one trillion, two hundred fifty billion, four hundred sixteen million, four hundred thirty-four thousand, five hundred six".