21829774 has 8 divisors (see below), whose sum is σ = 33193440. Its totient is φ = 10765296.

The previous prime is 21829763. The next prime is 21829777. The reversal of 21829774 is 47792812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829777) 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 3 ways as a sum of consecutive naturals, for example, 74614 + ... + 74905.

It is an arithmetic number, because the mean of its divisors is an integer number (4149180).

Almost surely, 2^21829774 is an apocalyptic number.

21829774 is a deficient number, since it is larger than the sum of its proper divisors (11363666).

21829774 is a wasteful number, since it uses less digits than its factorization.

21829774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149594.

The product of its digits is 56448, while the sum is 40.

The square root of 21829774 is about 4672.2343691215. The cubic root of 21829774 is about 279.4793641552.

It can be divided in two parts, 218 and 29774, that added together give a palindrome (29992).

The spelling of 21829774 in words is "twenty-one million, eight hundred twenty-nine thousand, seven hundred seventy-four".