21046827 has 4 divisors (see below), whose sum is σ = 28062440. Its totient is φ = 14031216.

The previous prime is 21046819. The next prime is 21046841. The reversal of 21046827 is 72864012.

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

It is not a de Polignac number, because 21046827 - 2³ = 21046819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21046794 and 21046803.

It is not an unprimeable number, because it can be changed into a prime (21046807) 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, 3507802 + ... + 3507807.

It is an arithmetic number, because the mean of its divisors is an integer number (7015610).

Almost surely, 2^21046827 is an apocalyptic number.

21046827 is a deficient number, since it is larger than the sum of its proper divisors (7015613).

21046827 is an equidigital number, since it uses as much as digits as its factorization.

21046827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015612.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21046827 is about 4587.6820944786. The cubic root of 21046827 is about 276.0973322961.

The spelling of 21046827 in words is "twenty-one million, forty-six thousand, eight hundred twenty-seven".