21754324 has 6 divisors (see below), whose sum is σ = 38070074. Its totient is φ = 10877160.

The previous prime is 21754307. The next prime is 21754351. The reversal of 21754324 is 42345712.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 777924 = 4580^2 + 882^2 .

It is a super-2 number, since 2×21754324² = 946501225393952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21754292 and 21754301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2719287 + ... + 2719294.

Almost surely, 2^21754324 is an apocalyptic number.

It is an amenable number.

21754324 is a deficient number, since it is larger than the sum of its proper divisors (16315750).

21754324 is a wasteful number, since it uses less digits than its factorization.

21754324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438585 (or 5438583 counting only the distinct ones).

The product of its digits is 6720, while the sum is 28.

The square root of 21754324 is about 4664.1530849662. The cubic root of 21754324 is about 279.1570053635.

The spelling of 21754324 in words is "twenty-one million, seven hundred fifty-four thousand, three hundred twenty-four".