20144125403021 has 4 divisors (see below), whose sum is σ = 20635445534844. Its totient is φ = 19652805271200.

The previous prime is 20144125402913. The next prime is 20144125403033. The reversal of 20144125403021 is 12030452144102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 988710046921 + 19155415356100 = 994339^2 + 4376690^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144125403021 - 2¹⁸ = 20144125140877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144125406021) 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, 245660065850 + ... + 245660065931.

It is an arithmetic number, because the mean of its divisors is an integer number (5158861383711).

Almost surely, 2^{20144125403021} is an apocalyptic number.

It is an amenable number.

20144125403021 is a deficient number, since it is larger than the sum of its proper divisors (491320131823).

20144125403021 is an equidigital number, since it uses as much as digits as its factorization.

20144125403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491320131822.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 20144125403021 its reverse (12030452144102), we get a palindrome (32174577547123).

The spelling of 20144125403021 in words is "twenty trillion, one hundred forty-four billion, one hundred twenty-five million, four hundred three thousand, twenty-one".