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21010452 = 2231750871
BaseRepresentation
bin101000000100…
…1100000010100
31110112102220220
41100021200110
520334313302
62030154340
7343404651
oct120114024
943472826
1021010452
1110950511
1270529b0
134478328
142b0cc28
151ca04bc
hex1409814

21010452 has 12 divisors (see below), whose sum is σ = 49024416. Its totient is φ = 7003480.

The previous prime is 21010441. The next prime is 21010469. The reversal of 21010452 is 25401012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875424 + ... + 875447.

It is an arithmetic number, because the mean of its divisors is an integer number (4085368).

Almost surely, 221010452 is an apocalyptic number.

It is an amenable number.

21010452 is an abundant number, since it is smaller than the sum of its proper divisors (28013964).

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

21010452 is a wasteful number, since it uses less digits than its factorization.

21010452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750878 (or 1750876 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21010452 is about 4583.7159597863. The cubic root of 21010452 is about 275.9381819123.

Adding to 21010452 its reverse (25401012), we get a palindrome (46411464).

The spelling of 21010452 in words is "twenty-one million, ten thousand, four hundred fifty-two".

Divisors: 1 2 3 4 6 12 1750871 3501742 5252613 7003484 10505226 21010452