21434200424 has 32 divisors (see below), whose sum is σ = 49463541120. Its totient is φ = 8479463616.

The previous prime is 21434200391. The next prime is 21434200441. The reversal of 21434200424 is 42400243412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 21434200393 and 21434200402.

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, 14720564 + ... + 14722019.

It is an arithmetic number, because the mean of its divisors is an integer number (1545735660).

Almost surely, 2^21434200424 is an apocalyptic number.

It is an amenable number.

21434200424 is an abundant number, since it is smaller than the sum of its proper divisors (28029340696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21434200424 is a wasteful number, since it uses less digits than its factorization.

21434200424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29442609 (or 29442605 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21434200424 its reverse (42400243412), we get a palindrome (63834443836).

The spelling of 21434200424 in words is "twenty-one billion, four hundred thirty-four million, two hundred thousand, four hundred twenty-four".