21231134040 has 32 divisors (see below), whose sum is σ = 63693402480. Its totient is φ = 5661635712.

The previous prime is 21231133993. The next prime is 21231134143. The reversal of 21231134040 is 4043113212.

It is a super-2 number, since 2×21231134040² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21231133998 and 21231134016.

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, 88462939 + ... + 88463178.

Almost surely, 2^21231134040 is an apocalyptic number.

21231134040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231134040 is an abundant number, since it is smaller than the sum of its proper divisors (42462268440).

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

21231134040 is a wasteful number, since it uses less digits than its factorization.

21231134040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176926131 (or 176926127 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21231134040 its reverse (4043113212), we get a palindrome (25274247252).

The spelling of 21231134040 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-four thousand, forty".