1270921 has 4 divisors (see below), whose sum is σ = 1274752. Its totient is φ = 1267092.

The previous prime is 1270909. The next prime is 1270933. The reversal of 1270921 is 1290721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1290721 = 41 ⋅31481.

It is an interprime number because it is at equal distance from previous prime (1270909) and next prime (1270933).

It is a cyclic number.

It is not a de Polignac number, because 1270921 - 2¹⁷ = 1139849 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1270892 and 1270901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1270901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (318688).

2^1270921 is an apocalyptic number.

It is an amenable number.

1270921 is a deficient number, since it is larger than the sum of its proper divisors (3831).

1270921 is an equidigital number, since it uses as much as digits as its factorization.

1270921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1270921 is about 1127.3513205740. The cubic root of 1270921 is about 108.3193849234.

The spelling of 1270921 in words is "one million, two hundred seventy thousand, nine hundred twenty-one".