21822051 has 8 divisors (see below), whose sum is σ = 30627520. Its totient is φ = 13782312.

The previous prime is 21822043. The next prime is 21822083. The reversal of 21822051 is 15022812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21822051 - 2³ = 21822043 is a prime.

It is a Duffinian 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, 191365 + ... + 191478.

It is an arithmetic number, because the mean of its divisors is an integer number (3828440).

Almost surely, 2^21822051 is an apocalyptic number.

21822051 is a deficient number, since it is larger than the sum of its proper divisors (8805469).

21822051 is a wasteful number, since it uses less digits than its factorization.

21822051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382865.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21822051 is about 4671.4078177783. The cubic root of 21822051 is about 279.4464019310.

Adding to 21822051 its reverse (15022812), we get a palindrome (36844863).

The spelling of 21822051 in words is "twenty-one million, eight hundred twenty-two thousand, fifty-one".