21740486 has 16 divisors (see below), whose sum is σ = 33982080. Its totient is φ = 10419840.

The previous prime is 21740483. The next prime is 21740489. The reversal of 21740486 is 68404712.

It is an interprime number because it is at equal distance from previous prime (21740483) and next prime (21740489).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5150 + ... + 8366.

It is an arithmetic number, because the mean of its divisors is an integer number (2123880).

Almost surely, 2^21740486 is an apocalyptic number.

21740486 is a deficient number, since it is larger than the sum of its proper divisors (12241594).

21740486 is a wasteful number, since it uses less digits than its factorization.

21740486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3359.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21740486 is about 4662.6694071101. The cubic root of 21740486 is about 279.0978018995.

The spelling of 21740486 in words is "twenty-one million, seven hundred forty thousand, four hundred eighty-six".