21435430024 has 8 divisors (see below), whose sum is σ = 40191431310. Its totient is φ = 10717715008.

The previous prime is 21435429979. The next prime is 21435430031. The reversal of 21435430024 is 42003453412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15462922500 + 5972507524 = 124350^2 + 77282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21435429974 and 21435430001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339714369 + ... + 1339714384.

Almost surely, 2^21435430024 is an apocalyptic number.

It is an amenable number.

21435430024 is a deficient number, since it is larger than the sum of its proper divisors (18756001286).

21435430024 is a wasteful number, since it uses less digits than its factorization.

21435430024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679428759 (or 2679428755 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21435430024 its reverse (42003453412), we get a palindrome (63438883436).

The spelling of 21435430024 in words is "twenty-one billion, four hundred thirty-five million, four hundred thirty thousand, twenty-four".