21723060 has 24 divisors (see below), whose sum is σ = 60824736. Its totient is φ = 5792800.

The previous prime is 21723043. The next prime is 21723067. The reversal of 21723060 is 6032712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723067) 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, 180966 + ... + 181085.

It is an arithmetic number, because the mean of its divisors is an integer number (2534364).

Almost surely, 2^21723060 is an apocalyptic number.

21723060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21723060 is an abundant number, since it is smaller than the sum of its proper divisors (39101676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21723060 is a wasteful number, since it uses less digits than its factorization.

21723060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362063 (or 362061 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21723060 is about 4660.8003604531. The cubic root of 21723060 is about 279.0232120563.

Adding to 21723060 its reverse (6032712), we get a palindrome (27755772).

The spelling of 21723060 in words is "twenty-one million, seven hundred twenty-three thousand, sixty".