21525100 has 36 divisors (see below), whose sum is σ = 49172200. Its totient is φ = 8156160.

The previous prime is 21525089. The next prime is 21525109. The reversal of 21525100 is 152512.

It is not an unprimeable number, because it can be changed into a prime (21525109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3765 + ... + 7564.

Almost surely, 2^21525100 is an apocalyptic number.

21525100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525100 is an abundant number, since it is smaller than the sum of its proper divisors (27647100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21525100 is a wasteful number, since it uses less digits than its factorization.

21525100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11362 (or 11355 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 21525100 is about 4639.5150608657. The cubic root of 21525100 is about 278.1730544413.

Adding to 21525100 its reverse (152512), we get a palindrome (21677612).

The spelling of 21525100 in words is "twenty-one million, five hundred twenty-five thousand, one hundred".