1122921 has 6 divisors (see below), whose sum is σ = 1622010. Its totient is φ = 748608.

The previous prime is 1122899. The next prime is 1122923. The reversal of 1122921 is 1292211.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 112896 = 1005^2 + 336^2 .

It is not a de Polignac number, because 1122921 - 2⁶ = 1122857 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1122894 and 1122903.

It is not an unprimeable number, because it can be changed into a prime (1122923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62376 + ... + 62393.

It is an arithmetic number, because the mean of its divisors is an integer number (270335).

2^1122921 is an apocalyptic number.

It is an amenable number.

1122921 is a deficient number, since it is larger than the sum of its proper divisors (499089).

1122921 is a wasteful number, since it uses less digits than its factorization.

1122921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124775 (or 124772 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1122921 is about 1059.6796685791. The cubic root of 1122921 is about 103.9400850653.

The spelling of 1122921 in words is "one million, one hundred twenty-two thousand, nine hundred twenty-one".