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21237089 = 61348149
BaseRepresentation
bin101000100000…
…0110101100001
31110221221210212
41101000311201
520414041324
62035103505
7345340466
oct121006541
943857725
1021237089
1110a95815
127141b95
134527533
142b6b66d
151ce770e
hex1440d61

21237089 has 4 divisors (see below), whose sum is σ = 21585300. Its totient is φ = 20888880.

The previous prime is 21237071. The next prime is 21237113. The reversal of 21237089 is 98073212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12285025 + 8952064 = 3505^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 21237089 - 212 = 21232993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21237289) 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, 174014 + ... + 174135.

It is an arithmetic number, because the mean of its divisors is an integer number (5396325).

Almost surely, 221237089 is an apocalyptic number.

It is an amenable number.

21237089 is a deficient number, since it is larger than the sum of its proper divisors (348211).

21237089 is an equidigital number, since it uses as much as digits as its factorization.

21237089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348210.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21237089 is about 4608.3716212997. The cubic root of 21237089 is about 276.9268053728.

The spelling of 21237089 in words is "twenty-one million, two hundred thirty-seven thousand, eighty-nine".

Divisors: 1 61 348149 21237089