21311333552 has 40 divisors (see below), whose sum is σ = 44063894016. Its totient is φ = 9949879296.

The previous prime is 21311333513. The next prime is 21311333573. The reversal of 21311333552 is 25533311312.

It is a happy number.

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, 273923 + ... + 343010.

Almost surely, 2^21311333552 is an apocalyptic number.

It is an amenable number.

21311333552 is an abundant number, since it is smaller than the sum of its proper divisors (22752560464).

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

21311333552 is a wasteful number, since it uses less digits than its factorization.

21311333552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617085 (or 617079 counting only the distinct ones).

The product of its digits is 8100, while the sum is 29.

Adding to 21311333552 its reverse (25533311312), we get a palindrome (46844644864).

The spelling of 21311333552 in words is "twenty-one billion, three hundred eleven million, three hundred thirty-three thousand, five hundred fifty-two".