21411542 has 4 divisors (see below), whose sum is σ = 32117316. Its totient is φ = 10705770.

The previous prime is 21411529. The next prime is 21411547. The reversal of 21411542 is 24511412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5352884 + ... + 5352887.

It is an arithmetic number, because the mean of its divisors is an integer number (8029329).

Almost surely, 2^21411542 is an apocalyptic number.

21411542 is a deficient number, since it is larger than the sum of its proper divisors (10705774).

21411542 is a wasteful number, since it uses less digits than its factorization.

21411542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10705773.

The product of its digits is 320, while the sum is 20.

The square root of 21411542 is about 4627.2607447603. The cubic root of 21411542 is about 277.6830143004.

Adding to 21411542 its reverse (24511412), we get a palindrome (45922954).

The spelling of 21411542 in words is "twenty-one million, four hundred eleven thousand, five hundred forty-two".