21929486 has 16 divisors (see below), whose sum is σ = 33527520. Its totient is φ = 10755360.

The previous prime is 21929461. The next prime is 21929489. The reversal of 21929486 is 68492912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21929489) 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, 55040 + ... + 55436.

It is an arithmetic number, because the mean of its divisors is an integer number (2095470).

Almost surely, 2^21929486 is an apocalyptic number.

21929486 is a deficient number, since it is larger than the sum of its proper divisors (11598034).

21929486 is a wasteful number, since it uses less digits than its factorization.

21929486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 62208, while the sum is 41.

The square root of 21929486 is about 4682.8929093030. The cubic root of 21929486 is about 279.9042444678.

The spelling of 21929486 in words is "twenty-one million, nine hundred twenty-nine thousand, four hundred eighty-six".