21263088 has 120 divisors (see below), whose sum is σ = 69134464. Its totient is φ = 5512320.

The previous prime is 21263083. The next prime is 21263089. The reversal of 21263088 is 88036212.

It is a super-2 number, since 2×21263088² = 904237822591488, which contains 22 as substring.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263083) 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 23 ways as a sum of consecutive naturals, for example, 40395 + ... + 40917.

Almost surely, 2^21263088 is an apocalyptic number.

21263088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21263088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34567232).

21263088 is an abundant number, since it is smaller than the sum of its proper divisors (47871376).

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

21263088 is a wasteful number, since it uses less digits than its factorization.

21263088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21263088 is about 4611.1916030458. The cubic root of 21263088 is about 277.0397663023.

The spelling of 21263088 in words is "twenty-one million, two hundred sixty-three thousand, eighty-eight".