4212139121 has 4 divisors (see below), whose sum is σ = 4281190644. Its totient is φ = 4143087600.

The previous prime is 4212139097. The next prime is 4212139153. The reversal of 4212139121 is 1219312124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 814531600 + 3397607521 = 28540^2 + 58289^2 .

It is a cyclic number.

It is not a de Polignac number, because 4212139121 - 2²⁶ = 4145030257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4212139171) 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, 34525670 + ... + 34525791.

It is an arithmetic number, because the mean of its divisors is an integer number (1070297661).

Almost surely, 2^4212139121 is an apocalyptic number.

It is an amenable number.

4212139121 is a deficient number, since it is larger than the sum of its proper divisors (69051523).

4212139121 is an equidigital number, since it uses as much as digits as its factorization.

4212139121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69051522.

The product of its digits is 864, while the sum is 26.

The square root of 4212139121 is about 64900.9947612515. The cubic root of 4212139121 is about 1614.9815640079.

The spelling of 4212139121 in words is "four billion, two hundred twelve million, one hundred thirty-nine thousand, one hundred twenty-one".