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201021212 = 22722731627
BaseRepresentation
bin10111111101101…
…01011100011100
3112000020221021002
423332311130130
5402430134322
631540325432
74660436450
oct1376653434
9460227232
10201021212
11a3520237
12573a3878
1332854082
141c9aa660
15129abc92
hexbfb571c

201021212 has 24 divisors (see below), whose sum is σ = 403826304. Its totient is φ = 85769712.

The previous prime is 201021211. The next prime is 201021229. The reversal of 201021212 is 212120102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 201021193 and 201021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9458 + ... + 22169.

It is an arithmetic number, because the mean of its divisors is an integer number (16826096).

Almost surely, 2201021212 is an apocalyptic number.

It is an amenable number.

201021212 is an abundant number, since it is smaller than the sum of its proper divisors (202805092).

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

201021212 is a wasteful number, since it uses less digits than its factorization.

201021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31865 (or 31863 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201021212 is about 14178.1949485821. The cubic root of 201021212 is about 585.7972056650.

Adding to 201021212 its reverse (212120102), we get a palindrome (413141314).

The spelling of 201021212 in words is "two hundred one million, twenty-one thousand, two hundred twelve".

Divisors: 1 2 4 7 14 28 227 454 908 1589 3178 6356 31627 63254 126508 221389 442778 885556 7179329 14358658 28717316 50255303 100510606 201021212