21829461 has 16 divisors (see below), whose sum is σ = 31971840. Its totient is φ = 13186800.

The previous prime is 21829439. The next prime is 21829463. The reversal of 21829461 is 16492812.

It is not a de Polignac number, because 21829461 - 2⁶ = 21829397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829463) 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, 7015 + ... + 9636.

It is an arithmetic number, because the mean of its divisors is an integer number (1998240).

Almost surely, 2^21829461 is an apocalyptic number.

It is an amenable number.

21829461 is a deficient number, since it is larger than the sum of its proper divisors (10142379).

21829461 is a wasteful number, since it uses less digits than its factorization.

21829461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16696.

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

The square root of 21829461 is about 4672.2008732502. The cubic root of 21829461 is about 279.4780284037.

The spelling of 21829461 in words is "twenty-one million, eight hundred twenty-nine thousand, four hundred sixty-one".