21248892 has 96 divisors (see below), whose sum is σ = 63920640. Its totient is φ = 6053616.

The previous prime is 21248881. The next prime is 21248893. The reversal of 21248892 is 29884212.

It is a super-2 number, since 2×21248892² = 903030822455328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21248893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61063 + ... + 61409.

It is an arithmetic number, because the mean of its divisors is an integer number (665840).

Almost surely, 2^21248892 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21248892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31960320).

21248892 is an abundant number, since it is smaller than the sum of its proper divisors (42671748).

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

21248892 is an equidigital number, since it uses as much as digits as its factorization.

21248892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 359 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 21248892 is about 4609.6520476062. The cubic root of 21248892 is about 276.9780986824.

It can be divided in two parts, 2124889 and 2, that added together give a triangular number (2124891 = T₂₀₆₁).

The spelling of 21248892 in words is "twenty-one million, two hundred forty-eight thousand, eight hundred ninety-two".