21221000012141 has 2 divisors, whose sum is σ = 21221000012142. Its totient is φ = 21221000012140.

The previous prime is 21221000012129. The next prime is 21221000012323. The reversal of 21221000012141 is 14121000012212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17751441856516 + 3469558155625 = 4213246^2 + 1862675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221000012141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221300012141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500006070 + 10610500006071.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500006071).

Almost surely, 2^{21221000012141} is an apocalyptic number.

It is an amenable number.

21221000012141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221000012141 is an equidigital number, since it uses as much as digits as its factorization.

21221000012141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221000012141 its reverse (14121000012212), we get a palindrome (35342000024353).

The spelling of 21221000012141 in words is "twenty-one trillion, two hundred twenty-one billion, twelve thousand, one hundred forty-one".