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21133201 = 39235387
BaseRepresentation
bin101000010011…
…1011110010001
31110202200022011
41100213132101
520402230301
62032542521
7344425555
oct120473621
943680264
1021133201
1110a24761
1270b1a41
1344bc16b
142b41865
151cc6a51
hex1427791

21133201 has 4 divisors (see below), whose sum is σ = 21142512. Its totient is φ = 21123892.

The previous prime is 21133153. The next prime is 21133213. The reversal of 21133201 is 10233112.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21133201 - 29 = 21132689 is a prime.

It is a super-2 number, since 2×211332012 = 893224369012802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133241) 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, 1230 + ... + 6616.

It is an arithmetic number, because the mean of its divisors is an integer number (5285628).

Almost surely, 221133201 is an apocalyptic number.

It is an amenable number.

21133201 is a deficient number, since it is larger than the sum of its proper divisors (9311).

21133201 is an equidigital number, since it uses as much as digits as its factorization.

21133201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21133201 is about 4597.0861423297. The cubic root of 21133201 is about 276.4745084284.

Adding to 21133201 its reverse (10233112), we get a palindrome (31366313).

The spelling of 21133201 in words is "twenty-one million, one hundred thirty-three thousand, two hundred one".

Divisors: 1 3923 5387 21133201