102020311301221 has 4 divisors (see below), whose sum is σ = 102443632095244. Its totient is φ = 101596990507200.

The previous prime is 102020311301219. The next prime is 102020311301231. The reversal of 102020311301221 is 122103113020201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37431282208321 + 64589029092900 = 6118111^2 + 8036730^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020311301221 - 2¹ = 102020311301219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020311301231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211660396650 + ... + 211660397131.

It is an arithmetic number, because the mean of its divisors is an integer number (25610908023811).

Almost surely, 2^{102020311301221} is an apocalyptic number.

It is an amenable number.

102020311301221 is a deficient number, since it is larger than the sum of its proper divisors (423320794023).

102020311301221 is an equidigital number, since it uses as much as digits as its factorization.

102020311301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423320794022.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 102020311301221 its reverse (122103113020201), we get a palindrome (224123424321422).

The spelling of 102020311301221 in words is "one hundred two trillion, twenty billion, three hundred eleven million, three hundred one thousand, two hundred twenty-one".