102020011220221 has 4 divisors (see below), whose sum is σ = 103417545620572. Its totient is φ = 100622476819872.

The previous prime is 102020011220207. The next prime is 102020011220261. The reversal of 102020011220221 is 122022110020201.

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 81194606748025 + 20825404472196 = 9010805^2 + 4563486^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020011220221 - 2³⁷ = 101882572266749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102020011220195 and 102020011220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020011220201) 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, 698767200066 + ... + 698767200211.

It is an arithmetic number, because the mean of its divisors is an integer number (25854386405143).

Almost surely, 2^{102020011220221} is an apocalyptic number.

It is an amenable number.

102020011220221 is a deficient number, since it is larger than the sum of its proper divisors (1397534400351).

102020011220221 is an equidigital number, since it uses as much as digits as its factorization.

102020011220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397534400350.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102020011220221 its reverse (122022110020201), we get a palindrome (224042121240422).

The spelling of 102020011220221 in words is "one hundred two trillion, twenty billion, eleven million, two hundred twenty thousand, two hundred twenty-one".