21746372 has 12 divisors (see below), whose sum is σ = 38406060. Its totient is φ = 10773216.

The previous prime is 21746363. The next prime is 21746399. The reversal of 21746372 is 27364712.

It can be written as a sum of positive squares in 2 ways, for example, as 6270016 + 15476356 = 2504^2 + 3934^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24503 + ... + 25374.

It is an arithmetic number, because the mean of its divisors is an integer number (3200505).

Almost surely, 2^21746372 is an apocalyptic number.

It is an amenable number.

21746372 is a deficient number, since it is larger than the sum of its proper divisors (16659688).

21746372 is a wasteful number, since it uses less digits than its factorization.

21746372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49990 (or 49988 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 21746372 is about 4663.3005478952. The cubic root of 21746372 is about 279.1229871910.

The spelling of 21746372 in words is "twenty-one million, seven hundred forty-six thousand, three hundred seventy-two".