21069927 has 6 divisors (see below), whose sum is σ = 30434352. Its totient is φ = 14046612.

The previous prime is 21069901. The next prime is 21069929. The reversal of 21069927 is 72996012.

It is not a de Polignac number, because 21069927 - 2¹² = 21065831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21069891 and 21069900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21069929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1170543 + ... + 1170560.

It is an arithmetic number, because the mean of its divisors is an integer number (5072392).

Almost surely, 2^21069927 is an apocalyptic number.

21069927 is a deficient number, since it is larger than the sum of its proper divisors (9364425).

21069927 is a wasteful number, since it uses less digits than its factorization.

21069927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341109 (or 2341106 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21069927 is about 4590.1990152933. The cubic root of 21069927 is about 276.1983058135.

The spelling of 21069927 in words is "twenty-one million, sixty-nine thousand, nine hundred twenty-seven".