1211412401 has 16 divisors (see below), whose sum is σ = 1293318720. Its totient is φ = 1130734080.

The previous prime is 1211412329. The next prime is 1211412407. The reversal of 1211412401 is 1042141121.

It is a cyclic number.

It is not a de Polignac number, because 1211412401 - 2¹⁸ = 1211150257 is a prime.

It is a super-3 number, since 3×1211412401³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211412401.

It is not an unprimeable number, because it can be changed into a prime (1211412407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638890 + ... + 1639628.

It is an arithmetic number, because the mean of its divisors is an integer number (80832420).

Almost surely, 2^1211412401 is an apocalyptic number.

It is an amenable number.

1211412401 is a deficient number, since it is larger than the sum of its proper divisors (81906319).

1211412401 is a wasteful number, since it uses less digits than its factorization.

1211412401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1211412401 is about 34805.3501778103. The cubic root of 1211412401 is about 1066.0166919841.

Adding to 1211412401 its reverse (1042141121), we get a palindrome (2253553522).

The spelling of 1211412401 in words is "one billion, two hundred eleven million, four hundred twelve thousand, four hundred one".