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21693427 = 722931511
BaseRepresentation
bin101001011000…
…0001111110011
31111211010210021
41102300033303
521023142202
62052544311
7352251100
oct122601763
944733707
1021693427
1111277658
127322097
134657162
142c49aa7
151d87a37
hex14b03f3

21693427 has 12 divisors (see below), whose sum is σ = 25338096. Its totient is φ = 18518640.

The previous prime is 21693407. The next prime is 21693437. The reversal of 21693427 is 72439612.

It is not a de Polignac number, because 21693427 - 27 = 21693299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21693392 and 21693401.

It is not an unprimeable number, because it can be changed into a prime (21693407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13602 + ... + 15112.

It is an arithmetic number, because the mean of its divisors is an integer number (2111508).

Almost surely, 221693427 is an apocalyptic number.

21693427 is a deficient number, since it is larger than the sum of its proper divisors (3644669).

21693427 is a wasteful number, since it uses less digits than its factorization.

21693427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818 (or 1811 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21693427 is about 4657.6203151395. The cubic root of 21693427 is about 278.8962800101.

The spelling of 21693427 in words is "twenty-one million, six hundred ninety-three thousand, four hundred twenty-seven".

Divisors: 1 7 49 293 1511 2051 10577 14357 74039 442723 3099061 21693427