21465542 has 16 divisors (see below), whose sum is σ = 36893472. Its totient is φ = 9175680.

The previous prime is 21465541. The next prime is 21465553. The reversal of 21465542 is 24556412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292 + ... + 7832.

It is an arithmetic number, because the mean of its divisors is an integer number (2305842).

Almost surely, 2^21465542 is an apocalyptic number.

21465542 is a deficient number, since it is larger than the sum of its proper divisors (15427930).

21465542 is a wasteful number, since it uses less digits than its factorization.

21465542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983.

The product of its digits is 9600, while the sum is 29.

The square root of 21465542 is about 4633.0920560680. The cubic root of 21465542 is about 277.9162575778.

It can be divided in two parts, 214 and 65542, that added together give a palindrome (65756).

The spelling of 21465542 in words is "twenty-one million, four hundred sixty-five thousand, five hundred forty-two".