1211401512 has 24 divisors (see below), whose sum is σ = 3280879290. Its totient is φ = 403800480.

The previous prime is 1211401483. The next prime is 1211401519. The reversal of 1211401512 is 2151041121.

1211401512 is a `hidden beast` number, since 1 + 211 + 401 + 51 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 861187716 + 350213796 = 29346^2 + 18714^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×1211401512³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1211401519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8412439 + ... + 8412582.

Almost surely, 2^1211401512 is an apocalyptic number.

1211401512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211401512 is an abundant number, since it is smaller than the sum of its proper divisors (2069477778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211401512 is a wasteful number, since it uses less digits than its factorization.

1211401512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16825033 (or 16825026 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1211401512 is about 34805.1937503586. The cubic root of 1211401512 is about 1066.0134979465.

Adding to 1211401512 its reverse (2151041121), we get a palindrome (3362442633).

The spelling of 1211401512 in words is "one billion, two hundred eleven million, four hundred one thousand, five hundred twelve".