1212151141 has 4 divisors (see below), whose sum is σ = 1220178784. Its totient is φ = 1204123500.

The previous prime is 1212151139. The next prime is 1212151147. The reversal of 1212151141 is 1411512121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1411512121 = 1423 ⋅991927.

It is a cyclic number.

It is not a de Polignac number, because 1212151141 - 2¹ = 1212151139 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 (1212151147) 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, 4013595 + ... + 4013896.

It is an arithmetic number, because the mean of its divisors is an integer number (305044696).

Almost surely, 2^1212151141 is an apocalyptic number.

It is an amenable number.

1212151141 is a deficient number, since it is larger than the sum of its proper divisors (8027643).

1212151141 is an equidigital number, since it uses as much as digits as its factorization.

1212151141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8027642.

The product of its digits is 80, while the sum is 19.

The square root of 1212151141 is about 34815.9610092842. The cubic root of 1212151141 is about 1066.2333396883.

Adding to 1212151141 its reverse (1411512121), we get a palindrome (2623663262).

The spelling of 1212151141 in words is "one billion, two hundred twelve million, one hundred fifty-one thousand, one hundred forty-one".