1211200401 has 8 divisors (see below), whose sum is σ = 1685148480. Its totient is φ = 772359632.

The previous prime is 1211200379. The next prime is 1211200421. The reversal of 1211200401 is 1040021121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211200401 - 2⁶ = 1211200337 is a prime.

It is a super-2 number, since 2×1211200401² = 2934012822765121602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211200421) 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 7 ways as a sum of consecutive naturals, for example, 8776746 + ... + 8776883.

It is an arithmetic number, because the mean of its divisors is an integer number (210643560).

Almost surely, 2^1211200401 is an apocalyptic number.

It is an amenable number.

1211200401 is a deficient number, since it is larger than the sum of its proper divisors (473948079).

1211200401 is a wasteful number, since it uses less digits than its factorization.

1211200401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17553655.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1211200401 is about 34802.3045357631. The cubic root of 1211200401 is about 1065.9545032192.

Adding to 1211200401 its reverse (1040021121), we get a palindrome (2251221522).

The spelling of 1211200401 in words is "one billion, two hundred eleven million, two hundred thousand, four hundred one".