21746072 has 32 divisors (see below), whose sum is σ = 42124320. Its totient is φ = 10517760.

The previous prime is 21746057. The next prime is 21746099. The reversal of 21746072 is 27064712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54578 + ... + 54974.

It is an arithmetic number, because the mean of its divisors is an integer number (1316385).

Almost surely, 2^21746072 is an apocalyptic number.

It is an amenable number.

21746072 is a deficient number, since it is larger than the sum of its proper divisors (20378248).

21746072 is a wasteful number, since it uses less digits than its factorization.

21746072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21746072 is about 4663.2683817254. The cubic root of 21746072 is about 279.1217036469.

The spelling of 21746072 in words is "twenty-one million, seven hundred forty-six thousand, seventy-two".