1321121253 has 8 divisors (see below), whose sum is σ = 1763030016. Its totient is φ = 879980000.

The previous prime is 1321121239. The next prime is 1321121257. The reversal of 1321121253 is 3521211231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321121253 - 2⁹ = 1321120741 is a prime.

It is a super-2 number, since 2×1321121253² = 3490722730256580018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321121257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187848 + ... + 194753.

It is an arithmetic number, because the mean of its divisors is an integer number (220378752).

Almost surely, 2^1321121253 is an apocalyptic number.

It is an amenable number.

1321121253 is a deficient number, since it is larger than the sum of its proper divisors (441908763).

1321121253 is a wasteful number, since it uses less digits than its factorization.

1321121253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383755.

The product of its digits is 360, while the sum is 21.

The square root of 1321121253 is about 36347.2317102692. The cubic root of 1321121253 is about 1097.2718213615.

Adding to 1321121253 its reverse (3521211231), we get a palindrome (4842332484).

The spelling of 1321121253 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred fifty-three".