1121621 has 2 divisors, whose sum is σ = 1121622. Its totient is φ = 1121620.

The previous prime is 1121599. The next prime is 1121629. The reversal of 1121621 is 1261211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 835396 + 286225 = 914^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121621 - 2⁶ = 1121557 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121596 and 1121605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560810 + 560811.

It is an arithmetic number, because the mean of its divisors is an integer number (560811).

2^1121621 is an apocalyptic number.

It is an amenable number.

1121621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121621 is an equidigital number, since it uses as much as digits as its factorization.

1121621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 14.

The square root of 1121621 is about 1059.0660980317. The cubic root of 1121621 is about 103.8999592720.

Adding to 1121621 its reverse (1261211), we get a palindrome (2382832).

The spelling of 1121621 in words is "one million, one hundred twenty-one thousand, six hundred twenty-one".