21122262 has 128 divisors (see below), whose sum is σ = 60134400. Its totient is φ = 5349888.

The previous prime is 21122251. The next prime is 21122267. The reversal of 21122262 is 26222112.

It is a super-2 number, since 2×21122262² = 892299903993288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122008 + ... + 122180.

It is an arithmetic number, because the mean of its divisors is an integer number (469800).

Almost surely, 2^21122262 is an apocalyptic number.

21122262 is the 2907-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30067200).

21122262 is an abundant number, since it is smaller than the sum of its proper divisors (39012138).

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

21122262 is a wasteful number, since it uses less digits than its factorization.

21122262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 221 counting only the distinct ones).

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

The square root of 21122262 is about 4595.8962129274. The cubic root of 21122262 is about 276.4267971419.

Adding to 21122262 its reverse (26222112), we get a palindrome (47344374).

The spelling of 21122262 in words is "twenty-one million, one hundred twenty-two thousand, two hundred sixty-two".