20144210251 has 4 divisors (see below), whose sum is σ = 21975502104. Its totient is φ = 18312918400.

The previous prime is 20144210243. The next prime is 20144210269. The reversal of 20144210251 is 15201244102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20144210251 - 2³ = 20144210243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20144210201) 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 3 ways as a sum of consecutive naturals, for example, 915645910 + ... + 915645931.

It is an arithmetic number, because the mean of its divisors is an integer number (5493875526).

Almost surely, 2^20144210251 is an apocalyptic number.

20144210251 is a deficient number, since it is larger than the sum of its proper divisors (1831291853).

20144210251 is a wasteful number, since it uses less digits than its factorization.

20144210251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831291852.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 20144210251 its reverse (15201244102), we get a palindrome (35345454353).

The spelling of 20144210251 in words is "twenty billion, one hundred forty-four million, two hundred ten thousand, two hundred fifty-one".