1321376253 has 8 divisors (see below), whose sum is σ = 1773660000. Its totient is φ = 875005008.

The previous prime is 1321376219. The next prime is 1321376267. The reversal of 1321376253 is 3526731231.

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

It is not a de Polignac number, because 1321376253 - 2¹⁴ = 1321359869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321376653) 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, 1477603 + ... + 1478496.

It is an arithmetic number, because the mean of its divisors is an integer number (221707500).

Almost surely, 2^1321376253 is an apocalyptic number.

It is an amenable number.

1321376253 is a deficient number, since it is larger than the sum of its proper divisors (452283747).

1321376253 is a wasteful number, since it uses less digits than its factorization.

1321376253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956251.

The product of its digits is 22680, while the sum is 33.

The square root of 1321376253 is about 36350.7393734983. The cubic root of 1321376253 is about 1097.3424145068.

The spelling of 1321376253 in words is "one billion, three hundred twenty-one million, three hundred seventy-six thousand, two hundred fifty-three".