1211401431201 has 16 divisors (see below), whose sum is σ = 1779900495296. Its totient is φ = 728141109696.

The previous prime is 1211401431199. The next prime is 1211401431203. The reversal of 1211401431201 is 1021341041121.

It is an interprime number because it is at equal distance from previous prime (1211401431199) and next prime (1211401431203).

It is not a de Polignac number, because 1211401431201 - 2¹ = 1211401431199 is a prime.

It is a super-3 number, since 3×1211401431201³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211401431203) 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, 361179430 + ... + 361182783.

It is an arithmetic number, because the mean of its divisors is an integer number (111243780956).

Almost surely, 2^{1211401431201} is an apocalyptic number.

It is an amenable number.

1211401431201 is a deficient number, since it is larger than the sum of its proper divisors (568499064095).

1211401431201 is a wasteful number, since it uses less digits than its factorization.

1211401431201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722362272.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 1211401431201 its reverse (1021341041121), we get a palindrome (2232742472322).

The spelling of 1211401431201 in words is "one trillion, two hundred eleven billion, four hundred one million, four hundred thirty-one thousand, two hundred one".