21512543035324 has 24 divisors (see below), whose sum is σ = 41069548619568. Its totient is φ = 9778393347840.

The previous prime is 21512543035289. The next prime is 21512543035339. The reversal of 21512543035324 is 42353034521512.

It is a super-2 number, since 2×21512543035324² (a number of 27 digits) contains 22 as substring.

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, 14426142 + ... + 15847354.

It is an arithmetic number, because the mean of its divisors is an integer number (1711231192482).

Almost surely, 2^{21512543035324} is an apocalyptic number.

It is an amenable number.

21512543035324 is a deficient number, since it is larger than the sum of its proper divisors (19557005584244).

21512543035324 is a wasteful number, since it uses less digits than its factorization.

21512543035324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765245 (or 1765243 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 40.

Adding to 21512543035324 its reverse (42353034521512), we get a palindrome (63865577556836).

The spelling of 21512543035324 in words is "twenty-one trillion, five hundred twelve billion, five hundred forty-three million, thirty-five thousand, three hundred twenty-four".