21535045 has 32 divisors (see below), whose sum is σ = 31046400. Its totient is φ = 14031360.

The previous prime is 21535027. The next prime is 21535091. The reversal of 21535045 is 54053512.

It is not a de Polignac number, because 21535045 - 2⁹ = 21534533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61531 + ... + 61879.

It is an arithmetic number, because the mean of its divisors is an integer number (970200).

Almost surely, 2^21535045 is an apocalyptic number.

It is an amenable number.

21535045 is a deficient number, since it is larger than the sum of its proper divisors (9511355).

21535045 is a wasteful number, since it uses less digits than its factorization.

21535045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 21535045 is about 4640.5867085962. The cubic root of 21535045 is about 278.2158882351.

Adding to 21535045 its reverse (54053512), we get a palindrome (75588557).

The spelling of 21535045 in words is "twenty-one million, five hundred thirty-five thousand, forty-five".