21461277 has 8 divisors (see below), whose sum is σ = 29859264. Its totient is φ = 13685408.

The previous prime is 21461249. The next prime is 21461287. The reversal of 21461277 is 77216412.

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 21461277 - 2⁶ = 21461213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461287) 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, 155448 + ... + 155585.

It is an arithmetic number, because the mean of its divisors is an integer number (3732408).

Almost surely, 2^21461277 is an apocalyptic number.

It is an amenable number.

21461277 is a deficient number, since it is larger than the sum of its proper divisors (8397987).

21461277 is a wasteful number, since it uses less digits than its factorization.

21461277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311059.

The product of its digits is 4704, while the sum is 30.

The square root of 21461277 is about 4632.6317574355. The cubic root of 21461277 is about 277.8978499154.

Adding to 21461277 its reverse (77216412), we get a palindrome (98677689).

The spelling of 21461277 in words is "twenty-one million, four hundred sixty-one thousand, two hundred seventy-seven".