1021099 has 4 divisors (see below), whose sum is σ = 1023400. Its totient is φ = 1018800.

The previous prime is 1021093. The next prime is 1021123. The reversal of 1021099 is 9901201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9901201 = 23 ⋅430487.

It is a cyclic number.

It is not a de Polignac number, because 1021099 - 2³ = 1021091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021091) 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, 249 + ... + 1450.

It is an arithmetic number, because the mean of its divisors is an integer number (255850).

2^1021099 is an apocalyptic number.

1021099 is a deficient number, since it is larger than the sum of its proper divisors (2301).

1021099 is an equidigital number, since it uses as much as digits as its factorization.

1021099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1021099 is about 1010.4944334335. The cubic root of 1021099 is about 100.6984108670.

The spelling of 1021099 in words is "one million, twenty-one thousand, ninety-nine".