20154014431321 has 2 divisors, whose sum is σ = 20154014431322. Its totient is φ = 20154014431320.

The previous prime is 20154014431319. The next prime is 20154014431351. The reversal of 20154014431321 is 12313441045102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13998335859225 + 6155678572096 = 3741435^2 + 2481064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20154014431321 - 2¹ = 20154014431319 is a prime.

Together with 20154014431319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20154014431301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077007215660 + 10077007215661.

It is an arithmetic number, because the mean of its divisors is an integer number (10077007215661).

Almost surely, 2^{20154014431321} is an apocalyptic number.

It is an amenable number.

20154014431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20154014431321 is an equidigital number, since it uses as much as digits as its factorization.

20154014431321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 20154014431321 its reverse (12313441045102), we get a palindrome (32467455476423).

The spelling of 20154014431321 in words is "twenty trillion, one hundred fifty-four billion, fourteen million, four hundred thirty-one thousand, three hundred twenty-one".