1121021621 has 2 divisors, whose sum is σ = 1121021622. Its totient is φ = 1121021620.

The previous prime is 1121021611. The next prime is 1121021683. The reversal of 1121021621 is 1261201211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863772100 + 257249521 = 29390^2 + 16039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121021621 - 2⁶ = 1121021557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121021621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121021611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510810 + 560510811.

It is an arithmetic number, because the mean of its divisors is an integer number (560510811).

Almost surely, 2^1121021621 is an apocalyptic number.

It is an amenable number.

1121021621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121021621 is an equidigital number, since it uses as much as digits as its factorization.

1121021621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 1121021621 is about 33481.6609653703. The cubic root of 1121021621 is about 1038.8144839953.

Adding to 1121021621 its reverse (1261201211), we get a palindrome (2382222832).

The spelling of 1121021621 in words is "one billion, one hundred twenty-one million, twenty-one thousand, six hundred twenty-one".