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21234497 = 23923239
BaseRepresentation
bin101000100000…
…0001101000001
31110221211020212
41101000031001
520414000442
62035043505
7345330104
oct121001501
943854225
1021234497
1110a93879
127140595
1345262bb
142b6a73b
151ce6a82
hex1440341

21234497 has 4 divisors (see below), whose sum is σ = 22157760. Its totient is φ = 20311236.

The previous prime is 21234487. The next prime is 21234509. The reversal of 21234497 is 79443212.

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 21234497 - 212 = 21230401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234427) by changing a digit.

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, 461597 + ... + 461642.

It is an arithmetic number, because the mean of its divisors is an integer number (5539440).

Almost surely, 221234497 is an apocalyptic number.

It is an amenable number.

21234497 is a deficient number, since it is larger than the sum of its proper divisors (923263).

21234497 is an equidigital number, since it uses as much as digits as its factorization.

21234497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923262.

The product of its digits is 12096, while the sum is 32.

The square root of 21234497 is about 4608.0903853983. The cubic root of 21234497 is about 276.9155385511.

The spelling of 21234497 in words is "twenty-one million, two hundred thirty-four thousand, four hundred ninety-seven".

Divisors: 1 23 923239 21234497