21469144 has 16 divisors (see below), whose sum is σ = 40327920. Its totient is φ = 10715040.

The previous prime is 21469121. The next prime is 21469163. The reversal of 21469144 is 44196412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2922 + ... + 7174.

It is an arithmetic number, because the mean of its divisors is an integer number (2520495).

Almost surely, 2^21469144 is an apocalyptic number.

It is an amenable number.

21469144 is a deficient number, since it is larger than the sum of its proper divisors (18858776).

21469144 is a wasteful number, since it uses less digits than its factorization.

21469144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4890 (or 4886 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 21469144 is about 4633.4807650405. The cubic root of 21469144 is about 277.9318018451.

The spelling of 21469144 in words is "twenty-one million, four hundred sixty-nine thousand, one hundred forty-four".