21231134534 has 8 divisors (see below), whose sum is σ = 31851800640. Its totient is φ = 10613867656.

The previous prime is 21231134513. The next prime is 21231134537. The reversal of 21231134534 is 43543113212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21231134534² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21231134497 and 21231134506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231134537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834134 + ... + 859209.

It is an arithmetic number, because the mean of its divisors is an integer number (3981475080).

Almost surely, 2^21231134534 is an apocalyptic number.

21231134534 is a deficient number, since it is larger than the sum of its proper divisors (10620666106).

21231134534 is a wasteful number, since it uses less digits than its factorization.

21231134534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699614.

The product of its digits is 8640, while the sum is 29.

Adding to 21231134534 its reverse (43543113212), we get a palindrome (64774247746).

The spelling of 21231134534 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-four thousand, five hundred thirty-four".