1247021 has 4 divisors (see below), whose sum is σ = 1259232. Its totient is φ = 1234812.

The previous prime is 1247017. The next prime is 1247033. The reversal of 1247021 is 1207421.

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: 1207421 = 37 ⋅32633.

It is a cyclic number.

It is not a de Polignac number, because 1247021 - 2² = 1247017 is a prime.

It is a super-2 number, since 2×1247021² = 3110122748882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247321) 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, 5951 + ... + 6156.

It is an arithmetic number, because the mean of its divisors is an integer number (314808).

2^1247021 is an apocalyptic number.

It is an amenable number.

1247021 is a deficient number, since it is larger than the sum of its proper divisors (12211).

1247021 is a wasteful number, since it uses less digits than its factorization.

1247021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12210.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 1247021 is about 1116.7009447475. The cubic root of 1247021 is about 107.6360922855.

The spelling of 1247021 in words is "one million, two hundred forty-seven thousand, twenty-one".