21382122 has 16 divisors (see below), whose sum is σ = 42875712. Its totient is φ = 7108800.

The previous prime is 21382121. The next prime is 21382129. The reversal of 21382122 is 22128312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21382121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2038 + ... + 6849.

It is an arithmetic number, because the mean of its divisors is an integer number (2679732).

Almost surely, 2^21382122 is an apocalyptic number.

21382122 is an abundant number, since it is smaller than the sum of its proper divisors (21493590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21382122 is a wasteful number, since it uses less digits than its factorization.

21382122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293.

The product of its digits is 384, while the sum is 21.

The square root of 21382122 is about 4624.0806653864. The cubic root of 21382122 is about 277.5557748454. Note that the first 3 decimals are identical.

The spelling of 21382122 in words is "twenty-one million, three hundred eighty-two thousand, one hundred twenty-two".