1211021241 has 16 divisors (see below), whose sum is σ = 1623121344. Its totient is φ = 803145024.

The previous prime is 1211021239. The next prime is 1211021243. The reversal of 1211021241 is 1421201121.

It is an interprime number because it is at equal distance from previous prime (1211021239) and next prime (1211021243).

It is not a de Polignac number, because 1211021241 - 2¹ = 1211021239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211021241.

It is not an unprimeable number, because it can be changed into a prime (1211021243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947695 + ... + 948971.

It is an arithmetic number, because the mean of its divisors is an integer number (101445084).

Almost surely, 2^1211021241 is an apocalyptic number.

It is an amenable number.

1211021241 is a deficient number, since it is larger than the sum of its proper divisors (412100103).

1211021241 is a wasteful number, since it uses less digits than its factorization.

1211021241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1211021241 is about 34799.7304730942. The cubic root of 1211021241 is about 1065.9019421880.

Adding to 1211021241 its reverse (1421201121), we get a palindrome (2632222362).

The spelling of 1211021241 in words is "one billion, two hundred eleven million, twenty-one thousand, two hundred forty-one".