21061434 has 8 divisors (see below), whose sum is σ = 42122880. Its totient is φ = 7020476.

The previous prime is 21061433. The next prime is 21061441. The reversal of 21061434 is 43416012.

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

21061434 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21061434.

It is not an unprimeable number, because it can be changed into a prime (21061433) 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 3 ways as a sum of consecutive naturals, for example, 1755114 + ... + 1755125.

It is an arithmetic number, because the mean of its divisors is an integer number (5265360).

Almost surely, 2^21061434 is an apocalyptic number.

21061434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21061434 is a wasteful number, since it uses less digits than its factorization.

21061434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510244.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21061434 is about 4589.2737987616. The cubic root of 21061434 is about 276.1611902370.

Adding to 21061434 its reverse (43416012), we get a palindrome (64477446).

The spelling of 21061434 in words is "twenty-one million, sixty-one thousand, four hundred thirty-four".