21455150 has 24 divisors (see below), whose sum is σ = 40039104. Its totient is φ = 8553600.

The previous prime is 21455143. The next prime is 21455183. The reversal of 21455150 is 5155412.

It is a happy number.

It is a congruent number.

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, 21155 + ... + 22145.

It is an arithmetic number, because the mean of its divisors is an integer number (1668296).

Almost surely, 2^21455150 is an apocalyptic number.

21455150 is a deficient number, since it is larger than the sum of its proper divisors (18583954).

21455150 is a wasteful number, since it uses less digits than its factorization.

21455150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436 (or 1431 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 21455150 is about 4631.9704230489. The cubic root of 21455150 is about 277.8714016261.

The spelling of 21455150 in words is "twenty-one million, four hundred fifty-five thousand, one hundred fifty".