21229754 has 32 divisors (see below), whose sum is σ = 39801216. Its totient is φ = 8268480.

The previous prime is 21229751. The next prime is 21229757. The reversal of 21229754 is 45792212.

It is an interprime number because it is at equal distance from previous prime (21229751) and next prime (21229757).

It is a self number, because there is not a number n which added to its sum of digits gives 21229754.

It is not an unprimeable number, because it can be changed into a prime (21229751) 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 15 ways as a sum of consecutive naturals, for example, 11324 + ... + 13064.

It is an arithmetic number, because the mean of its divisors is an integer number (1243788).

Almost surely, 2^21229754 is an apocalyptic number.

21229754 is a deficient number, since it is larger than the sum of its proper divisors (18571462).

21229754 is a wasteful number, since it uses less digits than its factorization.

21229754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its digits is 10080, while the sum is 32.

The square root of 21229754 is about 4607.5757183144. The cubic root of 21229754 is about 276.8949194582.

The spelling of 21229754 in words is "twenty-one million, two hundred twenty-nine thousand, seven hundred fifty-four".