21125196 has 18 divisors (see below), whose sum is σ = 53399892. Its totient is φ = 7041720.

The previous prime is 21125183. The next prime is 21125219. The reversal of 21125196 is 69152112.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293370 + ... + 293441.

Almost surely, 2^21125196 is an apocalyptic number.

It is an amenable number.

21125196 is an abundant number, since it is smaller than the sum of its proper divisors (32274696).

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

21125196 is a wasteful number, since it uses less digits than its factorization.

21125196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586821 (or 586816 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 21125196 is about 4596.2153996522. The cubic root of 21125196 is about 276.4395956240.

It can be divided in two parts, 21125 and 196, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 21125196 in words is "twenty-one million, one hundred twenty-five thousand, one hundred ninety-six".