1212401311 has 16 divisors (see below), whose sum is σ = 1360202400. Its totient is φ = 1070945280.

The previous prime is 1212401269. The next prime is 1212401321. The reversal of 1212401311 is 1131042121.

It is a cyclic number.

It is not a de Polignac number, because 1212401311 - 2¹⁷ = 1212270239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212401321) 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, 396115 + ... + 399163.

It is an arithmetic number, because the mean of its divisors is an integer number (85012650).

Almost surely, 2^1212401311 is an apocalyptic number.

1212401311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212401311 is a deficient number, since it is larger than the sum of its proper divisors (147801089).

1212401311 is a wasteful number, since it uses less digits than its factorization.

1212401311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4074.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1212401311 is about 34819.5535726695. The cubic root of 1212401311 is about 1066.3066862200.

Adding to 1212401311 its reverse (1131042121), we get a palindrome (2343443432).

The spelling of 1212401311 in words is "one billion, two hundred twelve million, four hundred one thousand, three hundred eleven".