10102021 has 4 divisors (see below), whose sum is σ = 10110112. Its totient is φ = 10093932.

The previous prime is 10102019. The next prime is 10102049. The reversal of 10102021 is 12020101.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12020101 = 409 ⋅29389.

It is a cyclic number.

It is not a de Polignac number, because 10102021 - 2¹ = 10102019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10101995 and 10102013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10102061) 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, 1731 + ... + 4816.

It is an arithmetic number, because the mean of its divisors is an integer number (2527528).

Almost surely, 2^10102021 is an apocalyptic number.

It is an amenable number.

10102021 is a deficient number, since it is larger than the sum of its proper divisors (8091).

10102021 is an equidigital number, since it uses as much as digits as its factorization.

10102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8090.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 10102021 is about 3178.3676628106. The cubic root of 10102021 is about 216.1736500825.

Adding to 10102021 its reverse (12020101), we get a palindrome (22122122).

It can be divided in two parts, 1010 and 2021, that multiplied together give a triangular number (2041210 = T₂₀₂₀).

The spelling of 10102021 in words is "ten million, one hundred two thousand, twenty-one".