202440021 has 24 divisors (see below), whose sum is σ = 314804160. Its totient is φ = 115379712.

The previous prime is 202439999. The next prime is 202440047. The reversal of 202440021 is 120044202.

202440021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 202440021 - 2²¹ = 200342869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202441021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62965 + ... + 66101.

It is an arithmetic number, because the mean of its divisors is an integer number (13116840).

Almost surely, 2^202440021 is an apocalyptic number.

202440021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202440021 is a deficient number, since it is larger than the sum of its proper divisors (112364139).

202440021 is a wasteful number, since it uses less digits than its factorization.

202440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3586 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 202440021 is about 14228.1418674400. The cubic root of 202440021 is about 587.1721627104.

Adding to 202440021 its reverse (120044202), we get a palindrome (322484223).

The spelling of 202440021 in words is "two hundred two million, four hundred forty thousand, twenty-one".