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21361027 = 171256531
BaseRepresentation
bin101000101111…
…1000110000011
31111012020211011
41101133012003
520432023102
62041501351
7346365022
oct121370603
944166734
1021361027
111106a946
1271a1857
13456ba7c
142ba08b9
151d1e2d7
hex145f183

21361027 has 4 divisors (see below), whose sum is σ = 22617576. Its totient is φ = 20104480.

The previous prime is 21361013. The next prime is 21361031. The reversal of 21361027 is 72016312.

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

It is a cyclic number.

It is not a de Polignac number, because 21361027 - 211 = 21358979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21360989 and 21361007.

It is not an unprimeable number, because it can be changed into a prime (21361097) 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, 628249 + ... + 628282.

It is an arithmetic number, because the mean of its divisors is an integer number (5654394).

Almost surely, 221361027 is an apocalyptic number.

21361027 is a deficient number, since it is larger than the sum of its proper divisors (1256549).

21361027 is a wasteful number, since it uses less digits than its factorization.

21361027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256548.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21361027 is about 4621.7991085723. The cubic root of 21361027 is about 277.4644685725.

Adding to 21361027 its reverse (72016312), we get a palindrome (93377339).

The spelling of 21361027 in words is "twenty-one million, three hundred sixty-one thousand, twenty-seven".

Divisors: 1 17 1256531 21361027