102021244242221 has 2 divisors, whose sum is σ = 102021244242222. Its totient is φ = 102021244242220.

The previous prime is 102021244242191. The next prime is 102021244242263. The reversal of 102021244242221 is 122242442120201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101785116277321 + 236127964900 = 10088861^2 + 485930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102021244242221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021244262221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010622121110 + 51010622121111.

It is an arithmetic number, because the mean of its divisors is an integer number (51010622121111).

Almost surely, 2^{102021244242221} is an apocalyptic number.

It is an amenable number.

102021244242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021244242221 is an equidigital number, since it uses as much as digits as its factorization.

102021244242221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 102021244242221 its reverse (122242442120201), we get a palindrome (224263686362422).

The spelling of 102021244242221 in words is "one hundred two trillion, twenty-one billion, two hundred forty-four million, two hundred forty-two thousand, two hundred twenty-one".