202002021 has 12 divisors (see below), whose sum is σ = 314225548. Its totient is φ = 124308864.

The previous prime is 202002013. The next prime is 202002061. The reversal of 202002021 is 120200202.

It can be written as a sum of positive squares in 2 ways, for example, as 17313921 + 184688100 = 4161^2 + 13590^2 .

It is not a de Polignac number, because 202002021 - 2³ = 202002013 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202001994 and 202002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202002001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 863140 + ... + 863373.

Almost surely, 2^202002021 is an apocalyptic number.

It is an amenable number.

202002021 is a deficient number, since it is larger than the sum of its proper divisors (112223527).

202002021 is a wasteful number, since it uses less digits than its factorization.

202002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726532 (or 1726529 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 202002021 is about 14212.7415019060. The cubic root of 202002021 is about 586.7483876274.

Adding to 202002021 its reverse (120200202), we get a palindrome (322202223).

The spelling of 202002021 in words is "two hundred two million, two thousand, twenty-one".