1211221301 has 4 divisors (see below), whose sum is σ = 1211332704. Its totient is φ = 1211109900.

The previous prime is 1211221237. The next prime is 1211221309. The reversal of 1211221301 is 1031221121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1211221301 - 2⁶ = 1211221237 is a prime.

It is a super-2 number, since 2×1211221301² = 2934114079992265202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37385 + ... + 61806.

It is an arithmetic number, because the mean of its divisors is an integer number (302833176).

Almost surely, 2^1211221301 is an apocalyptic number.

It is an amenable number.

1211221301 is a deficient number, since it is larger than the sum of its proper divisors (111403).

1211221301 is an equidigital number, since it uses as much as digits as its factorization.

1211221301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111402.

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

The square root of 1211221301 is about 34802.6048019398. The cubic root of 1211221301 is about 1065.9606344151.

Adding to 1211221301 its reverse (1031221121), we get a palindrome (2242442422).

The spelling of 1211221301 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, three hundred one".