21033100 has 36 divisors (see below), whose sum is σ = 49793688. Its totient is φ = 7648000.

The previous prime is 21033083. The next prime is 21033119. The reversal of 21033100 is 133012.

It is a super-2 number, since 2×21033100² = 884782591220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8461 + ... + 10660.

It is an arithmetic number, because the mean of its divisors is an integer number (1383158).

Almost surely, 2^21033100 is an apocalyptic number.

21033100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033100 is an abundant number, since it is smaller than the sum of its proper divisors (28760588).

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

21033100 is a wasteful number, since it uses less digits than its factorization.

21033100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19146 (or 19139 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21033100 is about 4586.1857790543. The cubic root of 21033100 is about 276.0372945473.

Adding to 21033100 its reverse (133012), we get a palindrome (21166112).

The spelling of 21033100 in words is "twenty-one million, thirty-three thousand, one hundred".