21404150 has 12 divisors (see below), whose sum is σ = 39811812. Its totient is φ = 8561640.

The previous prime is 21404147. The next prime is 21404183. The reversal of 21404150 is 5140412.

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, 213992 + ... + 214091.

It is an arithmetic number, because the mean of its divisors is an integer number (3317651).

Almost surely, 2^21404150 is an apocalyptic number.

21404150 is a deficient number, since it is larger than the sum of its proper divisors (18407662).

21404150 is a wasteful number, since it uses less digits than its factorization.

21404150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428095 (or 428090 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21404150 is about 4626.4619311089. The cubic root of 21404150 is about 277.6510553831.

Adding to 21404150 its reverse (5140412), we get a palindrome (26544562).

The spelling of 21404150 in words is "twenty-one million, four hundred four thousand, one hundred fifty".