21822006 has 16 divisors (see below), whose sum is σ = 44573184. Its totient is φ = 7119144.

The previous prime is 21822001. The next prime is 21822011. The reversal of 21822006 is 60022812.

It is an interprime number because it is at equal distance from previous prime (21822001) and next prime (21822011).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822001) 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, 38410 + ... + 38973.

It is an arithmetic number, because the mean of its divisors is an integer number (2785824).

Almost surely, 2^21822006 is an apocalyptic number.

21822006 is an abundant number, since it is smaller than the sum of its proper divisors (22751178).

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

21822006 is a wasteful number, since it uses less digits than its factorization.

21822006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77435.

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

The square root of 21822006 is about 4671.4030012406. The cubic root of 21822006 is about 279.4462098455.

Adding to 21822006 its reverse (60022812), we get a palindrome (81844818).

The spelling of 21822006 in words is "twenty-one million, eight hundred twenty-two thousand, six".