21434021044 has 12 divisors (see below), whose sum is σ = 37598636068. Its totient is φ = 10691553600.

The previous prime is 21434021029. The next prime is 21434021051. The reversal of 21434021044 is 44012043412.

It can be written as a sum of positive squares in 2 ways, for example, as 999318544 + 20434702500 = 31612^2 + 142950^2 .

It is a super-2 number, since 2×21434021044² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6362337 + ... + 6365704.

Almost surely, 2^21434021044 is an apocalyptic number.

It is an amenable number.

21434021044 is a deficient number, since it is larger than the sum of its proper divisors (16164615024).

21434021044 is a wasteful number, since it uses less digits than its factorization.

21434021044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12728466 (or 12728464 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21434021044 its reverse (44012043412), we get a palindrome (65446064456).

The spelling of 21434021044 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, forty-four".