21512530324322 has 4 divisors (see below), whose sum is σ = 32268795486486. Its totient is φ = 10756265162160.

The previous prime is 21512530324319. The next prime is 21512530324331. The reversal of 21512530324322 is 22342303521512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21261588438841 + 250941885481 = 4611029^2 + 500941^2 .

It is a super-2 number, since 2×21512530324322² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378132581079 + ... + 5378132581082.

Almost surely, 2^{21512530324322} is an apocalyptic number.

21512530324322 is a deficient number, since it is larger than the sum of its proper divisors (10756265162164).

21512530324322 is a wasteful number, since it uses less digits than its factorization.

21512530324322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756265162163.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21512530324322 its reverse (22342303521512), we get a palindrome (43854833845834).

The spelling of 21512530324322 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty million, three hundred twenty-four thousand, three hundred twenty-two".