21035487 has 24 divisors (see below), whose sum is σ = 31102848. Its totient is φ = 12635920.

The previous prime is 21035459. The next prime is 21035491. The reversal of 21035487 is 78453012.

It is not a de Polignac number, because 21035487 - 2⁷ = 21035359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60448 + ... + 60794.

It is an arithmetic number, because the mean of its divisors is an integer number (1295952).

Almost surely, 2^21035487 is an apocalyptic number.

21035487 is a deficient number, since it is larger than the sum of its proper divisors (10067361).

21035487 is a wasteful number, since it uses less digits than its factorization.

21035487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21035487 is about 4586.4460097117. The cubic root of 21035487 is about 276.0477364396.

Adding to 21035487 its reverse (78453012), we get a palindrome (99488499).

The spelling of 21035487 in words is "twenty-one million, thirty-five thousand, four hundred eighty-seven".