21277454 has 32 divisors (see below), whose sum is σ = 37065600. Its totient is φ = 9059040.

The previous prime is 21277441. The next prime is 21277457. The reversal of 21277454 is 45477212.

It is a self number, because there is not a number n which added to its sum of digits gives 21277454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45329 + ... + 45795.

It is an arithmetic number, because the mean of its divisors is an integer number (1158300).

Almost surely, 2^21277454 is an apocalyptic number.

21277454 is a deficient number, since it is larger than the sum of its proper divisors (15788146).

21277454 is a wasteful number, since it uses less digits than its factorization.

21277454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its digits is 15680, while the sum is 32.

The square root of 21277454 is about 4612.7490718659. The cubic root of 21277454 is about 277.1021444682.

The spelling of 21277454 in words is "twenty-one million, two hundred seventy-seven thousand, four hundred fifty-four".