202101021 has 16 divisors (see below), whose sum is σ = 299692800. Its totient is φ = 134606304.

The previous prime is 202100999. The next prime is 202101041. The reversal of 202101021 is 120101202.

It is not a de Polignac number, because 202101021 - 2⁶ = 202100957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 202100994 and 202101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31900 + ... + 37706.

It is an arithmetic number, because the mean of its divisors is an integer number (18730800).

Almost surely, 2^202101021 is an apocalyptic number.

It is an amenable number.

202101021 is a deficient number, since it is larger than the sum of its proper divisors (97591779).

202101021 is a wasteful number, since it uses less digits than its factorization.

202101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7105 (or 7099 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 202101021 is about 14216.2238657106. The cubic root of 202101021 is about 586.8442259481.

Adding to 202101021 its reverse (120101202), we get a palindrome (322202223).

The spelling of 202101021 in words is "two hundred two million, one hundred one thousand, twenty-one".