1321121512 has 32 divisors (see below), whose sum is σ = 2493592200. Its totient is φ = 656179200.

The previous prime is 1321121497. The next prime is 1321121563. The reversal of 1321121512 is 2151211231.

It can be written as a sum of positive squares in 4 ways, for example, as 1318706596 + 2414916 = 36314^2 + 1554^2 .

It is a super-2 number, since 2×1321121512² = 3490724098938332288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321121512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1235314 + ... + 1236382.

Almost surely, 2^1321121512 is an apocalyptic number.

It is an amenable number.

1321121512 is a deficient number, since it is larger than the sum of its proper divisors (1172470688).

1321121512 is a wasteful number, since it uses less digits than its factorization.

1321121512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957 (or 1953 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 1321121512 is about 36347.2352731263. The cubic root of 1321121512 is about 1097.2718930665.

Adding to 1321121512 its reverse (2151211231), we get a palindrome (3472332743).

The spelling of 1321121512 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, five hundred twelve".