21354562 has 4 divisors (see below), whose sum is σ = 32031846. Its totient is φ = 10677280.

The previous prime is 21354551. The next prime is 21354577. The reversal of 21354562 is 26545312.

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

It can be written as a sum of positive squares in only one way, i.e., 14432401 + 6922161 = 3799^2 + 2631^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21354562.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338639 + ... + 5338642.

Almost surely, 2^21354562 is an apocalyptic number.

21354562 is a deficient number, since it is larger than the sum of its proper divisors (10677284).

21354562 is a wasteful number, since it uses less digits than its factorization.

21354562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677283.

The product of its digits is 7200, while the sum is 28.

The square root of 21354562 is about 4621.0996526801. The cubic root of 21354562 is about 277.4364738388.

Adding to 21354562 its reverse (26545312), we get a palindrome (47899874).

The spelling of 21354562 in words is "twenty-one million, three hundred fifty-four thousand, five hundred sixty-two".