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202421 = 712851
BaseRepresentation
bin110001011010110101
3101021200002
4301122311
522434141
64201045
71502102
oct613265
9337602
10202421
1112909a
1299185
137119b
1453aa9
153ee9b
hex316b5

202421 has 4 divisors (see below), whose sum is σ = 205344. Its totient is φ = 199500.

The previous prime is 202409. The next prime is 202441. The reversal of 202421 is 124202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202421 - 26 = 202357 is a prime.

It is a super-2 number, since 2×2024212 = 81948522482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (51336).

2202421 is an apocalyptic number.

It is an amenable number.

202421 is a deficient number, since it is larger than the sum of its proper divisors (2923).

202421 is an equidigital number, since it uses as much as digits as its factorization.

202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 202421 is about 449.9122136595. The cubic root of 202421 is about 58.7153772158.

Adding to 202421 its reverse (124202), we get a palindrome (326623).

The spelling of 202421 in words is "two hundred two thousand, four hundred twenty-one", and thus it is an iban number.

Divisors: 1 71 2851 202421