2145121679 has 8 divisors (see below), whose sum is σ = 2260519680. Its totient is φ = 2029973400.

The previous prime is 2145121673. The next prime is 2145121691. The reversal of 2145121679 is 9761215412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145121679 - 2¹⁶ = 2145056143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145121673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44657 + ... + 79274.

It is an arithmetic number, because the mean of its divisors is an integer number (282564960).

Almost surely, 2^2145121679 is an apocalyptic number.

2145121679 is a deficient number, since it is larger than the sum of its proper divisors (115398001).

2145121679 is a wasteful number, since it uses less digits than its factorization.

2145121679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124861.

The product of its digits is 30240, while the sum is 38.

The square root of 2145121679 is about 46315.4583157719. The cubic root of 2145121679 is about 1289.6859758840.

The spelling of 2145121679 in words is "two billion, one hundred forty-five million, one hundred twenty-one thousand, six hundred seventy-nine".