1212242131 has 4 divisors (see below), whose sum is σ = 1218334000. Its totient is φ = 1206150264.

The previous prime is 1212242093. The next prime is 1212242147. The reversal of 1212242131 is 1312422121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1312422121 = 3391 ⋅387031.

It is a cyclic number.

It is not a de Polignac number, because 1212242131 - 2¹¹ = 1212240083 is a prime.

It is a super-2 number, since 2×1212242131² = 2939061968342842322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212242099 and 1212242108.

It is not an unprimeable number, because it can be changed into a prime (1212242231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3045636 + ... + 3046033.

It is an arithmetic number, because the mean of its divisors is an integer number (304583500).

Almost surely, 2^1212242131 is an apocalyptic number.

1212242131 is a deficient number, since it is larger than the sum of its proper divisors (6091869).

1212242131 is an equidigital number, since it uses as much as digits as its factorization.

1212242131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091868.

The product of its digits is 192, while the sum is 19.

The square root of 1212242131 is about 34817.2677130185. The cubic root of 1212242131 is about 1066.2600179192.

Adding to 1212242131 its reverse (1312422121), we get a palindrome (2524664252).

The spelling of 1212242131 in words is "one billion, two hundred twelve million, two hundred forty-two thousand, one hundred thirty-one".