21345133532 has 24 divisors (see below), whose sum is σ = 38983257600. Its totient is φ = 10207183536.

The previous prime is 21345133499. The next prime is 21345133543. The reversal of 21345133532 is 23533154312.

It is a super-2 number, since 2×21345133532² (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 7 ways as a sum of consecutive naturals, for example, 1179569 + ... + 1197527.

It is an arithmetic number, because the mean of its divisors is an integer number (1624302400).

Almost surely, 2^21345133532 is an apocalyptic number.

It is an amenable number.

21345133532 is a deficient number, since it is larger than the sum of its proper divisors (17638124068).

21345133532 is a wasteful number, since it uses less digits than its factorization.

21345133532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30905 (or 30903 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

Adding to 21345133532 its reverse (23533154312), we get a palindrome (44878287844).

The spelling of 21345133532 in words is "twenty-one billion, three hundred forty-five million, one hundred thirty-three thousand, five hundred thirty-two".