21221153484 has 48 divisors (see below), whose sum is σ = 50747128320. Its totient is φ = 6900004800.

The previous prime is 21221153479. The next prime is 21221153497. The reversal of 21221153484 is 48435112212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56167 + ... + 213534.

It is an arithmetic number, because the mean of its divisors is an integer number (1057231840).

Almost surely, 2^21221153484 is an apocalyptic number.

It is an amenable number.

21221153484 is an abundant number, since it is smaller than the sum of its proper divisors (29525974836).

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

21221153484 is a wasteful number, since it uses less digits than its factorization.

21221153484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269870 (or 269868 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

Adding to 21221153484 its reverse (48435112212), we get a palindrome (69656265696).

The spelling of 21221153484 in words is "twenty-one billion, two hundred twenty-one million, one hundred fifty-three thousand, four hundred eighty-four".