21446014434 has 64 divisors (see below), whose sum is σ = 46769923200. Its totient is φ = 6516536832.

The previous prime is 21446014409. The next prime is 21446014487. The reversal of 21446014434 is 43441064412.

It is a junction number, because it is equal to n+sod(n) for n = 21446014395 and 21446014404.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2657097 + ... + 2665155.

It is an arithmetic number, because the mean of its divisors is an integer number (730780050).

Almost surely, 2^21446014434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21446014434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23384961600).

21446014434 is an abundant number, since it is smaller than the sum of its proper divisors (25323908766).

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

21446014434 is a wasteful number, since it uses less digits than its factorization.

21446014434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8499.

The product of its (nonzero) digits is 36864, while the sum is 33.

Adding to 21446014434 its reverse (43441064412), we get a palindrome (64887078846).

The spelling of 21446014434 in words is "twenty-one billion, four hundred forty-six million, fourteen thousand, four hundred thirty-four".