21461254 has 16 divisors (see below), whose sum is σ = 33707520. Its totient is φ = 10228680.

The previous prime is 21461249. The next prime is 21461287. The reversal of 21461254 is 45216412.

It is a happy number.

It is a congruent number.

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, 16819 + ... + 18049.

It is an arithmetic number, because the mean of its divisors is an integer number (2106720).

Almost surely, 2^21461254 is an apocalyptic number.

21461254 is a deficient number, since it is larger than the sum of its proper divisors (12246266).

21461254 is a wasteful number, since it uses less digits than its factorization.

21461254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635.

The product of its digits is 1920, while the sum is 25.

The square root of 21461254 is about 4632.6292750446. The cubic root of 21461254 is about 277.8977506412.

Adding to 21461254 its reverse (45216412), we get a palindrome (66677666).

The spelling of 21461254 in words is "twenty-one million, four hundred sixty-one thousand, two hundred fifty-four".