21439192 has 8 divisors (see below), whose sum is σ = 40198500. Its totient is φ = 10719592.

The previous prime is 21439183. The next prime is 21439199. The reversal of 21439192 is 29193412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×21439192³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439199) 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 as a sum of consecutive naturals, namely, 1339942 + ... + 1339957.

Almost surely, 2^21439192 is an apocalyptic number.

It is an amenable number.

21439192 is a deficient number, since it is larger than the sum of its proper divisors (18759308).

21439192 is a wasteful number, since it uses less digits than its factorization.

21439192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679905 (or 2679901 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 21439192 is about 4630.2475095830. The cubic root of 21439192 is about 277.8024924262.

The spelling of 21439192 in words is "twenty-one million, four hundred thirty-nine thousand, one hundred ninety-two".