21427035 has 16 divisors (see below), whose sum is σ = 39181056. Its totient is φ = 9795168.

The previous prime is 21427013. The next prime is 21427037. The reversal of 21427035 is 53072412.

It is not a de Polignac number, because 21427035 - 2⁷ = 21426907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21426996 and 21427014.

It is not an unprimeable number, because it can be changed into a prime (21427037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101929 + ... + 102138.

It is an arithmetic number, because the mean of its divisors is an integer number (2448816).

Almost surely, 2^21427035 is an apocalyptic number.

21427035 is a deficient number, since it is larger than the sum of its proper divisors (17754021).

21427035 is a wasteful number, since it uses less digits than its factorization.

21427035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204082.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21427035 is about 4628.9345426351. The cubic root of 21427035 is about 277.7499736022.

Adding to 21427035 its reverse (53072412), we get a palindrome (74499447).

The spelling of 21427035 in words is "twenty-one million, four hundred twenty-seven thousand, thirty-five".