21838827 has 16 divisors (see below), whose sum is σ = 30263040. Its totient is φ = 13991712.

The previous prime is 21838823. The next prime is 21838837. The reversal of 21838827 is 72883812.

It is not a de Polignac number, because 21838827 - 2² = 21838823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21838823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24178 + ... + 25064.

It is an arithmetic number, because the mean of its divisors is an integer number (1891440).

Almost surely, 2^21838827 is an apocalyptic number.

21838827 is a deficient number, since it is larger than the sum of its proper divisors (8424213).

21838827 is a wasteful number, since it uses less digits than its factorization.

21838827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202.

The product of its digits is 43008, while the sum is 39.

The square root of 21838827 is about 4673.2030771196. The cubic root of 21838827 is about 279.5179930024.

The spelling of 21838827 in words is "twenty-one million, eight hundred thirty-eight thousand, eight hundred twenty-seven".