21927316 has 6 divisors (see below), whose sum is σ = 38372810. Its totient is φ = 10963656.

The previous prime is 21927313. The next prime is 21927329. The reversal of 21927316 is 61372912.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 3437316 = 4300^2 + 1854^2 .

It is a super-3 number, since 3×21927316³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2740911 + ... + 2740918.

Almost surely, 2^21927316 is an apocalyptic number.

It is an amenable number.

21927316 is a deficient number, since it is larger than the sum of its proper divisors (16445494).

21927316 is a wasteful number, since it uses less digits than its factorization.

21927316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481833 (or 5481831 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 21927316 is about 4682.6612091844. The cubic root of 21927316 is about 279.8950116591.

The spelling of 21927316 in words is "twenty-one million, nine hundred twenty-seven thousand, three hundred sixteen".