21120535 has 16 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 16380160.

The previous prime is 21120523. The next prime is 21120551. The reversal of 21120535 is 53502112.

It is not a de Polignac number, because 21120535 - 2⁵ = 21120503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54954 + ... + 55336.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^21120535 is an apocalyptic number.

21120535 is a deficient number, since it is larger than the sum of its proper divisors (5006825).

21120535 is a wasteful number, since it uses less digits than its factorization.

21120535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21120535 is about 4595.7083240780. The cubic root of 21120535 is about 276.4192631936.

Adding to 21120535 its reverse (53502112), we get a palindrome (74622647).

The spelling of 21120535 in words is "twenty-one million, one hundred twenty thousand, five hundred thirty-five".