21411042 has 16 divisors (see below), whose sum is σ = 43011840. Its totient is φ = 7105392.

The previous prime is 21411023. The next prime is 21411059. The reversal of 21411042 is 24011412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6418 + ... + 9165.

It is an arithmetic number, because the mean of its divisors is an integer number (2688240).

Almost surely, 2^21411042 is an apocalyptic number.

21411042 is an abundant number, since it is smaller than the sum of its proper divisors (21600798).

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

21411042 is a wasteful number, since it uses less digits than its factorization.

21411042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15817.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21411042 is about 4627.2067168001. The cubic root of 21411042 is about 277.6808528091.

Adding to 21411042 its reverse (24011412), we get a palindrome (45422454).

The spelling of 21411042 in words is "twenty-one million, four hundred eleven thousand, forty-two".