102020202021 has 4 divisors (see below), whose sum is σ = 136026936032. Its totient is φ = 68013468012.

The previous prime is 102020202017. The next prime is 102020202041. The reversal of 102020202021 is 120202020201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 102020202021 - 2² = 102020202017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102020201988 and 102020202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020202041) 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, 17003367001 + ... + 17003367006.

It is an arithmetic number, because the mean of its divisors is an integer number (34006734008).

Almost surely, 2^102020202021 is an apocalyptic number.

It is an amenable number.

102020202021 is a deficient number, since it is larger than the sum of its proper divisors (34006734011).

102020202021 is an equidigital number, since it uses as much as digits as its factorization.

102020202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34006734010.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 102020202021 its reverse (120202020201), we get a palindrome (222222222222).

The spelling of 102020202021 in words is "one hundred two billion, twenty million, two hundred two thousand, twenty-one".