1213512123213 has 24 divisors (see below), whose sum is σ = 1887935841792. Its totient is φ = 746677664928.

The previous prime is 1213512123163. The next prime is 1213512123247. The reversal of 1213512123213 is 3123212153121.

1213512123213 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 512 + 123 + 21 + 3 = 666.

It is not a de Polignac number, because 1213512123213 - 2¹³ = 1213512115021 is a prime.

It is a super-2 number, since 2×1213512123213² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213512123283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203320 + ... + 1571102.

It is an arithmetic number, because the mean of its divisors is an integer number (78663993408).

Almost surely, 2^{1213512123213} is an apocalyptic number.

1213512123213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1213512123213 is a deficient number, since it is larger than the sum of its proper divisors (674423718579).

1213512123213 is a wasteful number, since it uses less digits than its factorization.

1213512123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375385 (or 1375382 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

Adding to 1213512123213 its reverse (3123212153121), we get a palindrome (4336724276334).

The spelling of 1213512123213 in words is "one trillion, two hundred thirteen billion, five hundred twelve million, one hundred twenty-three thousand, two hundred thirteen".