21221522340371 has 2 divisors, whose sum is σ = 21221522340372. Its totient is φ = 21221522340370.

The previous prime is 21221522340331. The next prime is 21221522340433. The reversal of 21221522340371 is 17304322512212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221522340371 - 2⁶ = 21221522340307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221522340331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610761170185 + 10610761170186.

It is an arithmetic number, because the mean of its divisors is an integer number (10610761170186).

Almost surely, 2^{21221522340371} is an apocalyptic number.

21221522340371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221522340371 is an equidigital number, since it uses as much as digits as its factorization.

21221522340371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 21221522340371 its reverse (17304322512212), we get a palindrome (38525844852583).

The spelling of 21221522340371 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-two million, three hundred forty thousand, three hundred seventy-one".