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21589937 is a prime number
BaseRepresentation
bin101001001011…
…0111110110001
31111121212211022
41102112332301
521011334222
62050425225
7351340265
oct122267661
944555738
1021589937
1111206926
127292215
13461c015
142c200a5
151d67042
hex1496fb1

21589937 has 2 divisors, whose sum is σ = 21589938. Its totient is φ = 21589936.

The previous prime is 21589859. The next prime is 21589943. The reversal of 21589937 is 73998512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21077281 + 512656 = 4591^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 21589937 - 216 = 21524401 is a prime.

It is a super-2 number, since 2×215899372 = 932250759327938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21589037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10794968 + 10794969.

It is an arithmetic number, because the mean of its divisors is an integer number (10794969).

Almost surely, 221589937 is an apocalyptic number.

It is an amenable number.

21589937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21589937 is an equidigital number, since it uses as much as digits as its factorization.

21589937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 21589937 is about 4646.4972829003. The cubic root of 21589937 is about 278.4520748651.

The spelling of 21589937 in words is "twenty-one million, five hundred eighty-nine thousand, nine hundred thirty-seven".