20255276621 has 2 divisors, whose sum is σ = 20255276622. Its totient is φ = 20255276620.

The previous prime is 20255276599. The next prime is 20255276659. The reversal of 20255276621 is 12667255202.

It is a happy number.

It is an a-pointer prime, because the next prime (20255276659) can be obtained adding 20255276621 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20240752900 + 14523721 = 142270^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 20255276621 - 2¹⁴ = 20255260237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20255276521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127638310 + 10127638311.

It is an arithmetic number, because the mean of its divisors is an integer number (10127638311).

Almost surely, 2^20255276621 is an apocalyptic number.

It is an amenable number.

20255276621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20255276621 is an equidigital number, since it uses as much as digits as its factorization.

20255276621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 20255276621 in words is "twenty billion, two hundred fifty-five million, two hundred seventy-six thousand, six hundred twenty-one".