21849126 has 64 divisors (see below), whose sum is σ = 51770880. Its totient is φ = 6082560.

The previous prime is 21849101. The next prime is 21849127. The reversal of 21849126 is 62194812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849127) 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 31 ways as a sum of consecutive naturals, for example, 33766 + ... + 34406.

It is an arithmetic number, because the mean of its divisors is an integer number (808920).

Almost surely, 2^21849126 is an apocalyptic number.

21849126 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21849126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25885440).

21849126 is an abundant number, since it is smaller than the sum of its proper divisors (29921754).

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

21849126 is a wasteful number, since it uses less digits than its factorization.

21849126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its digits is 6912, while the sum is 33.

The square root of 21849126 is about 4674.3048681061. The cubic root of 21849126 is about 279.5619255115.

The spelling of 21849126 in words is "twenty-one million, eight hundred forty-nine thousand, one hundred twenty-six".