21531041412 has 96 divisors (see below), whose sum is σ = 51996672000. Its totient is φ = 6931267200.

The previous prime is 21531041407. The next prime is 21531041417. The reversal of 21531041412 is 21414013512.

It is an interprime number because it is at equal distance from previous prime (21531041407) and next prime (21531041417).

It is not an unprimeable number, because it can be changed into a prime (21531041417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11506837 + ... + 11508707.

It is an arithmetic number, because the mean of its divisors is an integer number (541632000).

Almost surely, 2^21531041412 is an apocalyptic number.

It is an amenable number.

21531041412 is an abundant number, since it is smaller than the sum of its proper divisors (30465630588).

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

21531041412 is a wasteful number, since it uses less digits than its factorization.

21531041412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217 (or 2215 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21531041412 its reverse (21414013512), we get a palindrome (42945054924).

The spelling of 21531041412 in words is "twenty-one billion, five hundred thirty-one million, forty-one thousand, four hundred twelve".