21254216434 has 16 divisors (see below), whose sum is σ = 35719618176. Its totient is φ = 9399898800.

The previous prime is 21254216407. The next prime is 21254216447. The reversal of 21254216434 is 43461245212.

It is a self number, because there is not a number n which added to its sum of digits gives 21254216434.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13054602 + ... + 13056229.

It is an arithmetic number, because the mean of its divisors is an integer number (2232476136).

Almost surely, 2^21254216434 is an apocalyptic number.

21254216434 is a deficient number, since it is larger than the sum of its proper divisors (14465401742).

21254216434 is a wasteful number, since it uses less digits than its factorization.

21254216434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26110881.

The product of its digits is 46080, while the sum is 34.

The spelling of 21254216434 in words is "twenty-one billion, two hundred fifty-four million, two hundred sixteen thousand, four hundred thirty-four".