202102021 has 16 divisors (see below), whose sum is σ = 230427648. Its totient is φ = 175618800.

The previous prime is 202102003. The next prime is 202102039. The reversal of 202102021 is 120201202.

It is an interprime number because it is at equal distance from previous prime (202102003) and next prime (202102039).

It is a cyclic number.

It is not a de Polignac number, because 202102021 - 2⁹ = 202101509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202101989 and 202102007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17686 + ... + 26776.

It is an arithmetic number, because the mean of its divisors is an integer number (14401728).

Almost surely, 2^202102021 is an apocalyptic number.

It is an amenable number.

202102021 is a deficient number, since it is larger than the sum of its proper divisors (28325627).

202102021 is a wasteful number, since it uses less digits than its factorization.

202102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9192.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 202102021 is about 14216.2590367508. The cubic root of 202102021 is about 586.8451938523.

Adding to 202102021 its reverse (120201202), we get a palindrome (322303223).

The spelling of 202102021 in words is "two hundred two million, one hundred two thousand, twenty-one".