21025035 has 16 divisors (see below), whose sum is σ = 37378080. Its totient is φ = 11213280.

The previous prime is 21025031. The next prime is 21025051. The reversal of 21025035 is 53052012.

It is a happy number.

It is not a de Polignac number, because 21025035 - 2² = 21025031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21024999 and 21025017.

It is not an unprimeable number, because it can be changed into a prime (21025031) 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, 77736 + ... + 78005.

It is an arithmetic number, because the mean of its divisors is an integer number (2336130).

Almost surely, 2^21025035 is an apocalyptic number.

21025035 is a deficient number, since it is larger than the sum of its proper divisors (16353045).

21025035 is a wasteful number, since it uses less digits than its factorization.

21025035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155755 (or 155749 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 21025035 is about 4585.3064237846. The cubic root of 21025035 is about 276.0020084920.

Adding to 21025035 its reverse (53052012), we get a palindrome (74077047).

The spelling of 21025035 in words is "twenty-one million, twenty-five thousand, thirty-five".