21530131521452 has 12 divisors (see below), whose sum is σ = 37761644932200. Its totient is φ = 10741090112256.

The previous prime is 21530131521383. The next prime is 21530131521469. The reversal of 21530131521452 is 25412513103512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5993910098 + ... + 5993913689.

It is an arithmetic number, because the mean of its divisors is an integer number (3146803744350).

Almost surely, 2^{21530131521452} is an apocalyptic number.

It is an amenable number.

21530131521452 is a deficient number, since it is larger than the sum of its proper divisors (16231513410748).

21530131521452 is a wasteful number, since it uses less digits than its factorization.

21530131521452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11987824240 (or 11987824238 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 21530131521452 its reverse (25412513103512), we get a palindrome (46942644624964).

The spelling of 21530131521452 in words is "twenty-one trillion, five hundred thirty billion, one hundred thirty-one million, five hundred twenty-one thousand, four hundred fifty-two".