21296100 has 72 divisors (see below), whose sum is σ = 70426048. Its totient is φ = 4867200.

The previous prime is 21296083. The next prime is 21296111. The reversal of 21296100 is 169212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2971 + ... + 7170.

Almost surely, 2^21296100 is an apocalyptic number.

21296100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21296100 is an abundant number, since it is smaller than the sum of its proper divisors (49129948).

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

21296100 is a wasteful number, since it uses less digits than its factorization.

21296100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10165 (or 10158 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21296100 is about 4614.7697667381. The cubic root of 21296100 is about 277.1830648333.

The spelling of 21296100 in words is "twenty-one million, two hundred ninety-six thousand, one hundred".