21354525 has 36 divisors (see below), whose sum is σ = 38649312. Its totient is φ = 11269920.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354525 is 52545312.

It is a happy number.

21354525 is a `hidden beast` number, since 2 + 135 + 4 + 525 = 666.

It is not a de Polignac number, because 21354525 - 2⁹ = 21354013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23632 + ... + 24518.

It is an arithmetic number, because the mean of its divisors is an integer number (1073592).

Almost surely, 2^21354525 is an apocalyptic number.

21354525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21354525 is a deficient number, since it is larger than the sum of its proper divisors (17294787).

21354525 is a wasteful number, since it uses less digits than its factorization.

21354525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 1002 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 21354525 is about 4621.0956493022. The cubic root of 21354525 is about 277.4363136052.

Adding to 21354525 its reverse (52545312), we get a palindrome (73899837).

The spelling of 21354525 in words is "twenty-one million, three hundred fifty-four thousand, five hundred twenty-five".