21010434 has 8 divisors (see below), whose sum is σ = 42020880. Its totient is φ = 7003476.

The previous prime is 21010433. The next prime is 21010441. The reversal of 21010434 is 43401012.

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

21010434 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21010433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750864 + ... + 1750875.

It is an arithmetic number, because the mean of its divisors is an integer number (5252610).

Almost surely, 2^21010434 is an apocalyptic number.

21010434 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.

21010434 is a wasteful number, since it uses less digits than its factorization.

21010434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501744.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21010434 is about 4583.7139963135. The cubic root of 21010434 is about 275.9381031120.

Adding to 21010434 its reverse (43401012), we get a palindrome (64411446).

The spelling of 21010434 in words is "twenty-one million, ten thousand, four hundred thirty-four".