1097021 has 4 divisors (see below), whose sum is σ = 1112544. Its totient is φ = 1081500.

The previous prime is 1097017. The next prime is 1097029. The reversal of 1097021 is 1207901.

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.

It is a cyclic number.

It is not a de Polignac number, because 1097021 - 2² = 1097017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1096984 and 1097002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097029) 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, 7655 + ... + 7796.

It is an arithmetic number, because the mean of its divisors is an integer number (278136).

2^1097021 is an apocalyptic number.

It is an amenable number.

1097021 is a deficient number, since it is larger than the sum of its proper divisors (15523).

1097021 is an equidigital number, since it uses as much as digits as its factorization.

1097021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15522.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 1097021 is about 1047.3877028111. The cubic root of 1097021 is about 103.1347405553.

The spelling of 1097021 in words is "one million, ninety-seven thousand, twenty-one".