10202102021 has 4 divisors (see below), whose sum is σ = 10205479872. Its totient is φ = 10198724172.

The previous prime is 10202102017. The next prime is 10202102039. The reversal of 10202102021 is 12020120201.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12020120201 = 52999 ⋅226799.

It is a cyclic number.

It is not a de Polignac number, because 10202102021 - 2² = 10202102017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202101993 and 10202102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202102921) 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, 1684391 + ... + 1690436.

It is an arithmetic number, because the mean of its divisors is an integer number (2551369968).

Almost surely, 2^10202102021 is an apocalyptic number.

It is an amenable number.

10202102021 is a deficient number, since it is larger than the sum of its proper divisors (3377851).

10202102021 is an equidigital number, since it uses as much as digits as its factorization.

10202102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377850.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10202102021 its reverse (12020120201), we get a palindrome (22222222222).

The spelling of 10202102021 in words is "ten billion, two hundred two million, one hundred two thousand, twenty-one".