21211848 has 64 divisors (see below), whose sum is σ = 67344000. Its totient is φ = 6060096.

The previous prime is 21211831. The next prime is 21211849. The reversal of 21211848 is 84811212.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is not an unprimeable number, because it can be changed into a prime (21211849) 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 15 ways as a sum of consecutive naturals, for example, 5503 + ... + 8526.

It is an arithmetic number, because the mean of its divisors is an integer number (1052250).

Almost surely, 2^21211848 is an apocalyptic number.

21211848 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21211848 is an abundant number, since it is smaller than the sum of its proper divisors (46132152).

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

21211848 is a wasteful number, since it uses less digits than its factorization.

21211848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14051 (or 14041 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 21211848 is about 4605.6322041605. The cubic root of 21211848 is about 276.8170495807.

It can be divided in two parts, 2121 and 1848, that added together give a square (3969 = 63²).

The spelling of 21211848 in words is "twenty-one million, two hundred eleven thousand, eight hundred forty-eight".