21495542 has 4 divisors (see below), whose sum is σ = 32243316. Its totient is φ = 10747770.

The previous prime is 21495541. The next prime is 21495569. The reversal of 21495542 is 24559412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21495499 and 21495508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21495541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5373884 + ... + 5373887.

It is an arithmetic number, because the mean of its divisors is an integer number (8060829).

Almost surely, 2^21495542 is an apocalyptic number.

21495542 is a deficient number, since it is larger than the sum of its proper divisors (10747774).

21495542 is a wasteful number, since it uses less digits than its factorization.

21495542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10747773.

The product of its digits is 14400, while the sum is 32.

The square root of 21495542 is about 4636.3285043232. The cubic root of 21495542 is about 278.0456681872.

The spelling of 21495542 in words is "twenty-one million, four hundred ninety-five thousand, five hundred forty-two".