21425461 has 8 divisors (see below), whose sum is σ = 22497120. Its totient is φ = 20376048.

The previous prime is 21425431. The next prime is 21425471. The reversal of 21425461 is 16452412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21425461 - 2⁷ = 21425333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425401) 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, 3571 + ... + 7456.

It is an arithmetic number, because the mean of its divisors is an integer number (2812140).

Almost surely, 2^21425461 is an apocalyptic number.

It is an amenable number.

21425461 is a deficient number, since it is larger than the sum of its proper divisors (1071659).

21425461 is a wasteful number, since it uses less digits than its factorization.

21425461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11123.

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

The square root of 21425461 is about 4628.7645219864. The cubic root of 21425461 is about 277.7431723942.

Adding to 21425461 its reverse (16452412), we get a palindrome (37877873).

The spelling of 21425461 in words is "twenty-one million, four hundred twenty-five thousand, four hundred sixty-one".