21434750591643 has 6 divisors (see below), whose sum is σ = 30961306410164. Its totient is φ = 14289833727756.

The previous prime is 21434750591593. The next prime is 21434750591651. The reversal of 21434750591643 is 34619505743412.

21434750591643 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 4 + 7 + 5 + 0 + 591 + 6 + 43 = 666.

It is not a de Polignac number, because 21434750591643 - 2²⁸ = 21434482156187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21434750591643.

It is not an unprimeable number, because it can be changed into a prime (21434750591693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1190819477305 + ... + 1190819477322.

Almost surely, 2^{21434750591643} is an apocalyptic number.

21434750591643 is a deficient number, since it is larger than the sum of its proper divisors (9526555818521).

21434750591643 is a wasteful number, since it uses less digits than its factorization.

21434750591643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381638954633 (or 2381638954630 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 21434750591643 in words is "twenty-one trillion, four hundred thirty-four billion, seven hundred fifty million, five hundred ninety-one thousand, six hundred forty-three".