21492376 has 8 divisors (see below), whose sum is σ = 40298220. Its totient is φ = 10746184.

The previous prime is 21492371. The next prime is 21492379. The reversal of 21492376 is 67329412.

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

It is a super-2 number, since 2×21492376² = 923844452250752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492371) 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 as a sum of consecutive naturals, namely, 1343266 + ... + 1343281.

Almost surely, 2^21492376 is an apocalyptic number.

It is an amenable number.

21492376 is a deficient number, since it is larger than the sum of its proper divisors (18805844).

21492376 is a wasteful number, since it uses less digits than its factorization.

21492376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686553 (or 2686549 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21492376 is about 4635.9870577904. The cubic root of 21492376 is about 278.0320167394.

The spelling of 21492376 in words is "twenty-one million, four hundred ninety-two thousand, three hundred seventy-six".