21128150 has 12 divisors (see below), whose sum is σ = 39298452. Its totient is φ = 8451240.

The previous prime is 21128137. The next prime is 21128167. The reversal of 21128150 is 5182112.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 211232 + ... + 211331.

It is an arithmetic number, because the mean of its divisors is an integer number (3274871).

Almost surely, 2^21128150 is an apocalyptic number.

21128150 is a deficient number, since it is larger than the sum of its proper divisors (18170302).

21128150 is a wasteful number, since it uses less digits than its factorization.

21128150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422575 (or 422570 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 21128150 is about 4596.5367397640. The cubic root of 21128150 is about 276.4524801515.

The spelling of 21128150 in words is "twenty-one million, one hundred twenty-eight thousand, one hundred fifty".