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202130021 = 367550763
BaseRepresentation
bin11000000110001…
…00001001100101
3112002100021021002
430003010021211
5403221130041
632020203045
75003035232
oct1403041145
9462307232
10202130021
11a4108305
1257839485
1332b51982
141cbb8789
1512b2a59b
hexc0c4265

202130021 has 4 divisors (see below), whose sum is σ = 202681152. Its totient is φ = 201578892.

The previous prime is 202130011. The next prime is 202130023. The reversal of 202130021 is 120031202.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2k-202130021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202129984 and 202130011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202130023) 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, 275015 + ... + 275748.

It is an arithmetic number, because the mean of its divisors is an integer number (50670288).

Almost surely, 2202130021 is an apocalyptic number.

It is an amenable number.

202130021 is a deficient number, since it is larger than the sum of its proper divisors (551131).

202130021 is an equidigital number, since it uses as much as digits as its factorization.

202130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551130.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 202130021 is about 14217.2437905524. The cubic root of 202130021 is about 586.8722938726.

Adding to 202130021 its reverse (120031202), we get a palindrome (322161223).

The spelling of 202130021 in words is "two hundred two million, one hundred thirty thousand, twenty-one".

Divisors: 1 367 550763 202130021