1211621 has 2 divisors, whose sum is σ = 1211622. Its totient is φ = 1211620.

The previous prime is 1211603. The next prime is 1211629. The reversal of 1211621 is 1261121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113025 + 98596 = 1055^2 + 314^2 .

It is an emirp because it is prime and its reverse (1261121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211621 - 2¹⁰ = 1210597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211596 and 1211605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605810 + 605811.

It is an arithmetic number, because the mean of its divisors is an integer number (605811).

2^1211621 is an apocalyptic number.

It is an amenable number.

1211621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211621 is an equidigital number, since it uses as much as digits as its factorization.

1211621 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 1211621 is about 1100.7365715738. The cubic root of 1211621 is about 106.6077876007.

Adding to 1211621 its reverse (1261121), we get a palindrome (2472742).

The spelling of 1211621 in words is "one million, two hundred eleven thousand, six hundred twenty-one".