21455489434 has 16 divisors (see below), whose sum is σ = 34101449280. Its totient is φ = 10095818400.

The previous prime is 21455489431. The next prime is 21455489479. The reversal of 21455489434 is 43498455412.

It is a super-3 number, since 3×21455489434³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21455489431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1863859 + ... + 1875334.

It is an arithmetic number, because the mean of its divisors is an integer number (2131340580).

Almost surely, 2^21455489434 is an apocalyptic number.

21455489434 is a deficient number, since it is larger than the sum of its proper divisors (12645959846).

21455489434 is a wasteful number, since it uses less digits than its factorization.

21455489434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739365.

The product of its digits is 2764800, while the sum is 49.

The spelling of 21455489434 in words is "twenty-one billion, four hundred fifty-five million, four hundred eighty-nine thousand, four hundred thirty-four".