21454377 has 32 divisors (see below), whose sum is σ = 34940928. Its totient is φ = 11442816.

The previous prime is 21454373. The next prime is 21454379. The reversal of 21454377 is 77345412.

It is not a de Polignac number, because 21454377 - 2² = 21454373 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21454373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20253 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (1091904).

Almost surely, 2^21454377 is an apocalyptic number.

It is an amenable number.

21454377 is a deficient number, since it is larger than the sum of its proper divisors (13486551).

21454377 is a wasteful number, since it uses less digits than its factorization.

21454377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109.

The product of its digits is 23520, while the sum is 33.

The square root of 21454377 is about 4631.8869804865. The cubic root of 21454377 is about 277.8680644759.

Adding to 21454377 its reverse (77345412), we get a palindrome (98799789).

The spelling of 21454377 in words is "twenty-one million, four hundred fifty-four thousand, three hundred seventy-seven".