21221262 has 12 divisors (see below), whose sum is σ = 45979440. Its totient is φ = 7073748.

The previous prime is 21221257. The next prime is 21221273. The reversal of 21221262 is 26212212.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178959 = 21221262 / (2 + 1 + 2 + 2 + 1 + 2 + 6 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589462 + ... + 589497.

It is an arithmetic number, because the mean of its divisors is an integer number (3831620).

Almost surely, 2^21221262 is an apocalyptic number.

21221262 is an abundant number, since it is smaller than the sum of its proper divisors (24758178).

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

21221262 is a wasteful number, since it uses less digits than its factorization.

21221262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178967 (or 1178964 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21221262 is about 4606.6541003205. The cubic root of 21221262 is about 276.8579947840.

Adding to 21221262 its reverse (26212212), we get a palindrome (47433474).

The spelling of 21221262 in words is "twenty-one million, two hundred twenty-one thousand, two hundred sixty-two".