21461222 has 16 divisors (see below), whose sum is σ = 34160640. Its totient is φ = 10083528.

The previous prime is 21461213. The next prime is 21461233. The reversal of 21461222 is 22216412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21461194 and 21461203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2603 + ... + 7049.

It is an arithmetic number, because the mean of its divisors is an integer number (2135040).

Almost surely, 2^21461222 is an apocalyptic number.

21461222 is a deficient number, since it is larger than the sum of its proper divisors (12699418).

21461222 is a wasteful number, since it uses less digits than its factorization.

21461222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595.

The product of its digits is 384, while the sum is 20.

The square root of 21461222 is about 4632.6258212811. The cubic root of 21461222 is about 277.8976125204.

Adding to 21461222 its reverse (22216412), we get a palindrome (43677634).

The spelling of 21461222 in words is "twenty-one million, four hundred sixty-one thousand, two hundred twenty-two".