21469136 has 20 divisors (see below), whose sum is σ = 44796612. Its totient is φ = 9908736.

The previous prime is 21469121. The next prime is 21469163. The reversal of 21469136 is 63196412.

It can be written as a sum of positive squares in 2 ways, for example, as 1577536 + 19891600 = 1256^2 + 4460^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 51401 + ... + 51816.

Almost surely, 2^21469136 is an apocalyptic number.

21469136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21469136 is an abundant number, since it is smaller than the sum of its proper divisors (23327476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21469136 is a wasteful number, since it uses less digits than its factorization.

21469136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103238 (or 103232 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 21469136 is about 4633.4799017585. The cubic root of 21469136 is about 277.9317673234.

The spelling of 21469136 in words is "twenty-one million, four hundred sixty-nine thousand, one hundred thirty-six".