21672100 has 36 divisors (see below), whose sum is σ = 48552448. Its totient is φ = 8388000.

The previous prime is 21672097. The next prime is 21672107. The reversal of 21672100 is 127612.

It is not an unprimeable number, because it can be changed into a prime (21672107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396 + ... + 6595.

Almost surely, 2^21672100 is an apocalyptic number.

21672100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21672100 is an abundant number, since it is smaller than the sum of its proper divisors (26880348).

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

21672100 is a wasteful number, since it uses less digits than its factorization.

21672100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036 (or 7029 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21672100 is about 4655.3302782939. The cubic root of 21672100 is about 278.8048549099.

Adding to 21672100 its reverse (127612), we get a palindrome (21799712).

The spelling of 21672100 in words is "twenty-one million, six hundred seventy-two thousand, one hundred".