21436274 has 16 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 10269168.

The previous prime is 21436271. The next prime is 21436301. The reversal of 21436274 is 47263412.

It is not an unprimeable number, because it can be changed into a prime (21436271) 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 7 ways as a sum of consecutive naturals, for example, 2207 + ... + 6909.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^21436274 is an apocalyptic number.

21436274 is a deficient number, since it is larger than the sum of its proper divisors (12093838).

21436274 is a wasteful number, since it uses less digits than its factorization.

21436274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801.

The product of its digits is 8064, while the sum is 29.

The square root of 21436274 is about 4629.9323969147. The cubic root of 21436274 is about 277.7898883372.

Adding to 21436274 its reverse (47263412), we get a palindrome (68699686).

The spelling of 21436274 in words is "twenty-one million, four hundred thirty-six thousand, two hundred seventy-four".