20213000221361 has 2 divisors, whose sum is σ = 20213000221362. Its totient is φ = 20213000221360.

The previous prime is 20213000221319. The next prime is 20213000221429. The reversal of 20213000221361 is 16312200031202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18771908014336 + 1441092207025 = 4332656^2 + 1200455^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213000221361 - 2²² = 20212996027057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20213000221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106500110680 + 10106500110681.

It is an arithmetic number, because the mean of its divisors is an integer number (10106500110681).

Almost surely, 2^{20213000221361} is an apocalyptic number.

It is an amenable number.

20213000221361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213000221361 is an equidigital number, since it uses as much as digits as its factorization.

20213000221361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20213000221361 its reverse (16312200031202), we get a palindrome (36525200252563).

The spelling of 20213000221361 in words is "twenty trillion, two hundred thirteen billion, two hundred twenty-one thousand, three hundred sixty-one".