20531044421 has 16 divisors (see below), whose sum is σ = 21770728560. Its totient is φ = 19327418880.

The previous prime is 20531044411. The next prime is 20531044427. The reversal of 20531044421 is 12444013502.

It can be written as a sum of positive squares in 8 ways, for example, as 1852355521 + 18678688900 = 43039^2 + 136670^2 .

It is not a de Polignac number, because 20531044421 - 2³⁰ = 19457302597 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 (20531044427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293871 + ... + 2302803.

It is an arithmetic number, because the mean of its divisors is an integer number (1360670535).

Almost surely, 2^20531044421 is an apocalyptic number.

It is an amenable number.

20531044421 is a deficient number, since it is larger than the sum of its proper divisors (1239684139).

20531044421 is a wasteful number, since it uses less digits than its factorization.

20531044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10936.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20531044421 its reverse (12444013502), we get a palindrome (32975057923).

The spelling of 20531044421 in words is "twenty billion, five hundred thirty-one million, forty-four thousand, four hundred twenty-one".