1211244001 has 6 divisors (see below), whose sum is σ = 1331367506. Its totient is φ = 1101130800.

The previous prime is 1211243993. The next prime is 1211244031. The reversal of 1211244001 is 1004421121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1193771601 + 17472400 = 34551^2 + 4180^2 .

It is not a de Polignac number, because 1211244001 - 2³ = 1211243993 is a prime.

It is a super-2 number, since 2×1211244001² = 2934224059916976002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211244031) 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 5 ways as a sum of consecutive naturals, for example, 5005020 + ... + 5005261.

Almost surely, 2^1211244001 is an apocalyptic number.

1211244001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211244001 is a deficient number, since it is larger than the sum of its proper divisors (120123505).

1211244001 is a wasteful number, since it uses less digits than its factorization.

1211244001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010303 (or 10010292 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1211244001 is about 34802.9309254264. The cubic root of 1211244001 is about 1065.9672935767.

Adding to 1211244001 its reverse (1004421121), we get a palindrome (2215665122).

The spelling of 1211244001 in words is "one billion, two hundred eleven million, two hundred forty-four thousand, one".