21221420141 has 2 divisors, whose sum is σ = 21221420142. Its totient is φ = 21221420140.

The previous prime is 21221420123. The next prime is 21221420159. The reversal of 21221420141 is 14102412212.

It is a balanced prime because it is at equal distance from previous prime (21221420123) and next prime (21221420159).

It can be written as a sum of positive squares in only one way, i.e., 20113196041 + 1108224100 = 141821^2 + 33290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221420141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221420191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610710070 + 10610710071.

It is an arithmetic number, because the mean of its divisors is an integer number (10610710071).

Almost surely, 2^21221420141 is an apocalyptic number.

It is an amenable number.

21221420141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221420141 is an equidigital number, since it uses as much as digits as its factorization.

21221420141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221420141 its reverse (14102412212), we get a palindrome (35323832353).

The spelling of 21221420141 in words is "twenty-one billion, two hundred twenty-one million, four hundred twenty thousand, one hundred forty-one".