102020202002021 has 4 divisors (see below), whose sum is σ = 103030303012044. Its totient is φ = 101010100992000.

The previous prime is 102020202002011. The next prime is 102020202002023. The reversal of 102020202002021 is 120200202020201.

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 99741267573025 + 2278934428996 = 9987055^2 + 1509614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102020202002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102020202001987 and 102020202002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020202002023) 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, 505050504860 + ... + 505050505061.

It is an arithmetic number, because the mean of its divisors is an integer number (25757575753011).

Almost surely, 2^{102020202002021} is an apocalyptic number.

It is an amenable number.

102020202002021 is a deficient number, since it is larger than the sum of its proper divisors (1010101010023).

102020202002021 is a wasteful number, since it uses less digits than its factorization.

102020202002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010101010022.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 102020202002021 its reverse (120200202020201), we get a palindrome (222220404022222).

The spelling of 102020202002021 in words is "one hundred two trillion, twenty billion, two hundred two million, two thousand, twenty-one".