21191150 has 12 divisors (see below), whose sum is σ = 39415632. Its totient is φ = 8476440.

The previous prime is 21191147. The next prime is 21191153. The reversal of 21191150 is 5119112.

It is an interprime number because it is at equal distance from previous prime (21191147) and next prime (21191153).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211862 + ... + 211961.

It is an arithmetic number, because the mean of its divisors is an integer number (3284636).

Almost surely, 2^21191150 is an apocalyptic number.

21191150 is a deficient number, since it is larger than the sum of its proper divisors (18224482).

21191150 is a wasteful number, since it uses less digits than its factorization.

21191150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423835 (or 423830 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 21191150 is about 4603.3846243824. The cubic root of 21191150 is about 276.7269831881.

The spelling of 21191150 in words is "twenty-one million, one hundred ninety-one thousand, one hundred fifty".