102202221020021 has 4 divisors (see below), whose sum is σ = 102524625503052. Its totient is φ = 101879816536992.

The previous prime is 102202221019981. The next prime is 102202221020033. The reversal of 102202221020021 is 120020122202201.

It is a happy number.

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 5309402157796 + 96892818862225 = 2304214^2 + 9843415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102202221020021 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 (102202221020041) 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, 161202241040 + ... + 161202241673.

It is an arithmetic number, because the mean of its divisors is an integer number (25631156375763).

Almost surely, 2^{102202221020021} is an apocalyptic number.

It is an amenable number.

102202221020021 is a deficient number, since it is larger than the sum of its proper divisors (322404483031).

102202221020021 is an equidigital number, since it uses as much as digits as its factorization.

102202221020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322404483030.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 102202221020021 its reverse (120020122202201), we get a palindrome (222222343222222).

The spelling of 102202221020021 in words is "one hundred two trillion, two hundred two billion, two hundred twenty-one million, twenty thousand, twenty-one".