2154140121 has 48 divisors (see below), whose sum is σ = 3416936832. Its totient is φ = 1182424320.

The previous prime is 2154140063. The next prime is 2154140147. The reversal of 2154140121 is 1210414512.

It is not a de Polignac number, because 2154140121 - 2⁷ = 2154139993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2154140921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3491005 + ... + 3491621.

It is an arithmetic number, because the mean of its divisors is an integer number (71186184).

Almost surely, 2^2154140121 is an apocalyptic number.

2154140121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2154140121 is a deficient number, since it is larger than the sum of its proper divisors (1262796711).

2154140121 is a wasteful number, since it uses less digits than its factorization.

2154140121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 2154140121 is about 46412.7150789522. The cubic root of 2154140121 is about 1291.4907991669.

Adding to 2154140121 its reverse (1210414512), we get a palindrome (3364554633).

The spelling of 2154140121 in words is "two billion, one hundred fifty-four million, one hundred forty thousand, one hundred twenty-one".