21320202322501 has 2 divisors, whose sum is σ = 21320202322502. Its totient is φ = 21320202322500.

The previous prime is 21320202322493. The next prime is 21320202322519. The reversal of 21320202322501 is 10522320202312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19824302097601 + 1495900224900 = 4452449^2 + 1223070^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320202322501 - 2³ = 21320202322493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320202322801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660101161250 + 10660101161251.

It is an arithmetic number, because the mean of its divisors is an integer number (10660101161251).

Almost surely, 2^{21320202322501} is an apocalyptic number.

It is an amenable number.

21320202322501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320202322501 is an equidigital number, since it uses as much as digits as its factorization.

21320202322501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21320202322501 its reverse (10522320202312), we get a palindrome (31842522524813).

The spelling of 21320202322501 in words is "twenty-one trillion, three hundred twenty billion, two hundred two million, three hundred twenty-two thousand, five hundred one".