2154023121 has 4 divisors (see below), whose sum is σ = 2872030832. Its totient is φ = 1436015412.

The previous prime is 2154023101. The next prime is 2154023129. The reversal of 2154023121 is 1213204512.

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.

It is not a de Polignac number, because 2154023121 - 2⁵ = 2154023089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2154023129) 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, 359003851 + ... + 359003856.

It is an arithmetic number, because the mean of its divisors is an integer number (718007708).

Almost surely, 2^2154023121 is an apocalyptic number.

It is an amenable number.

2154023121 is a deficient number, since it is larger than the sum of its proper divisors (718007711).

2154023121 is an equidigital number, since it uses as much as digits as its factorization.

2154023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718007710.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2154023121 is about 46411.4546313731. The cubic root of 2154023121 is about 1291.4674167264.

Adding to 2154023121 its reverse (1213204512), we get a palindrome (3367227633).

The spelling of 2154023121 in words is "two billion, one hundred fifty-four million, twenty-three thousand, one hundred twenty-one".