27021900 has 36 divisors (see below), whose sum is σ = 78184232. Its totient is φ = 7205760.

The previous prime is 27021893. The next prime is 27021901. The reversal of 27021900 is 912072.

It is a happy number.

It is a super-2 number, since 2×27021900² = 1460366159220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27021901) 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, 44737 + ... + 45336.

Almost surely, 2^27021900 is an apocalyptic number.

27021900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27021900 is an abundant number, since it is smaller than the sum of its proper divisors (51162332).

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

27021900 is a wasteful number, since it uses less digits than its factorization.

27021900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90090 (or 90083 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 27021900 is about 5198.2593240430. The cubic root of 27021900 is about 300.0810891909.

Adding to 27021900 its reverse (912072), we get a palindrome (27933972).

The spelling of 27021900 in words is "twenty-seven million, twenty-one thousand, nine hundred".