20540053421 has 2 divisors, whose sum is σ = 20540053422. Its totient is φ = 20540053420.

The previous prime is 20540053399. The next prime is 20540053447. The reversal of 20540053421 is 12435004502.

It is a happy number.

It is an a-pointer prime, because the next prime (20540053447) can be obtained adding 20540053421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16653902500 + 3886150921 = 129050^2 + 62339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20540053421 is a prime.

It is a super-3 number, since 3×20540053421³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20540053481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270026710 + 10270026711.

It is an arithmetic number, because the mean of its divisors is an integer number (10270026711).

Almost surely, 2^20540053421 is an apocalyptic number.

It is an amenable number.

20540053421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540053421 is an equidigital number, since it uses as much as digits as its factorization.

20540053421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20540053421 its reverse (12435004502), we get a palindrome (32975057923).

The spelling of 20540053421 in words is "twenty billion, five hundred forty million, fifty-three thousand, four hundred twenty-one".