1211401503213 has 16 divisors (see below), whose sum is σ = 1786855997952. Its totient is φ = 723842126000.

The previous prime is 1211401503209. The next prime is 1211401503251. The reversal of 1211401503213 is 3123051041121.

It is a cyclic number.

It is not a de Polignac number, because 1211401503213 - 2² = 1211401503209 is a prime.

It is a super-3 number, since 3×1211401503213³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211401503113) 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, 258512703 + ... + 258517388.

It is an arithmetic number, because the mean of its divisors is an integer number (111678499872).

Almost surely, 2^{1211401503213} is an apocalyptic number.

It is an amenable number.

1211401503213 is a deficient number, since it is larger than the sum of its proper divisors (575454494739).

1211401503213 is a wasteful number, since it uses less digits than its factorization.

1211401503213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517030176.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 1211401503213 its reverse (3123051041121), we get a palindrome (4334452544334).

The spelling of 1211401503213 in words is "one trillion, two hundred eleven billion, four hundred one million, five hundred three thousand, two hundred thirteen".