21527427 has 8 divisors (see below), whose sum is σ = 28810240. Its totient is φ = 14298120.

The previous prime is 21527417. The next prime is 21527459. The reversal of 21527427 is 72472512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21527427 - 2⁴ = 21527411 is a prime.

It is a super-2 number, since 2×21527427² = 926860226480658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21527394 and 21527403.

It is not an unprimeable number, because it can be changed into a prime (21527417) 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, 12427 + ... + 14052.

It is an arithmetic number, because the mean of its divisors is an integer number (3601280).

Almost surely, 2^21527427 is an apocalyptic number.

21527427 is a deficient number, since it is larger than the sum of its proper divisors (7282813).

21527427 is a wasteful number, since it uses less digits than its factorization.

21527427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26753.

The product of its digits is 7840, while the sum is 30.

The square root of 21527427 is about 4639.7658346085. The cubic root of 21527427 is about 278.1830781713.

Adding to 21527427 its reverse (72472512), we get a palindrome (93999939).

The spelling of 21527427 in words is "twenty-one million, five hundred twenty-seven thousand, four hundred twenty-seven".