20154003121 has 8 divisors (see below), whose sum is σ = 23568801344. Its totient is φ = 16873118640.

The previous prime is 20154003113. The next prime is 20154003127. The reversal of 20154003121 is 12130045102.

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

It is not a de Polignac number, because 20154003121 - 2³ = 20154003113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154003127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33478110 + ... + 33478711.

It is an arithmetic number, because the mean of its divisors is an integer number (2946100168).

Almost surely, 2^20154003121 is an apocalyptic number.

It is an amenable number.

20154003121 is a deficient number, since it is larger than the sum of its proper divisors (3414798223).

20154003121 is an equidigital number, since it uses as much as digits as its factorization.

20154003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66956871.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 20154003121 its reverse (12130045102), we get a palindrome (32284048223).

The spelling of 20154003121 in words is "twenty billion, one hundred fifty-four million, three thousand, one hundred twenty-one".