2154122015 has 8 divisors (see below), whose sum is σ = 2585230128. Its totient is φ = 1723108480.

The previous prime is 2154122011. The next prime is 2154122077. The reversal of 2154122015 is 5102214512.

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

It is not a de Polignac number, because 2154122015 - 2² = 2154122011 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 (2154122011) 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, 44135 + ... + 79095.

It is an arithmetic number, because the mean of its divisors is an integer number (323153766).

Almost surely, 2^2154122015 is an apocalyptic number.

2154122015 is a deficient number, since it is larger than the sum of its proper divisors (431108113).

2154122015 is a wasteful number, since it uses less digits than its factorization.

2154122015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47289.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2154122015 is about 46412.5200242348. The cubic root of 2154122015 is about 1291.4871807396.

Adding to 2154122015 its reverse (5102214512), we get a palindrome (7256336527).

The spelling of 2154122015 in words is "two billion, one hundred fifty-four million, one hundred twenty-two thousand, fifteen".