202421124 has 54 divisors (see below), whose sum is σ = 524024046. Its totient is φ = 65882880.

The previous prime is 202421123. The next prime is 202421171. The reversal of 202421124 is 421124202.

It can be written as a sum of positive squares in only one way, i.e., 201356100 + 1065024 = 14190^2 + 1032^2 .

It is a super-2 number, since 2×202421124² = 81948622882846752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 202421097 and 202421106.

It is not an unprimeable number, because it can be changed into a prime (202421123) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 65044 + ... + 68084.

It is an arithmetic number, because the mean of its divisors is an integer number (9704149).

Almost surely, 2^202421124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202421124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262012023).

202421124 is an abundant number, since it is smaller than the sum of its proper divisors (321602922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202421124 is a wasteful number, since it uses less digits than its factorization.

202421124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3089 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 202421124 is about 14227.4777806890. The cubic root of 202421124 is about 587.1538920516.

Adding to 202421124 its reverse (421124202), we get a palindrome (623545326).

The spelling of 202421124 in words is "two hundred two million, four hundred twenty-one thousand, one hundred twenty-four".