20380576552421 has 2 divisors, whose sum is σ = 20380576552422. Its totient is φ = 20380576552420.

The previous prime is 20380576552417. The next prime is 20380576552423. The reversal of 20380576552421 is 12425567508302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18044909284900 + 2335667267521 = 4247930^2 + 1528289^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380576552421 - 2² = 20380576552417 is a prime.

It is a super-2 number, since 2×20380576552421² (a number of 27 digits) contains 22 as substring.

Together with 20380576552423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20380576552421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20380576552423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190288276210 + 10190288276211.

It is an arithmetic number, because the mean of its divisors is an integer number (10190288276211).

Almost surely, 2^{20380576552421} is an apocalyptic number.

It is an amenable number.

20380576552421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380576552421 is an equidigital number, since it uses as much as digits as its factorization.

20380576552421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 50.

The spelling of 20380576552421 in words is "twenty trillion, three hundred eighty billion, five hundred seventy-six million, five hundred fifty-two thousand, four hundred twenty-one".