21150984 has 32 divisors (see below), whose sum is σ = 55177920. Its totient is φ = 6743616.

The previous prime is 21150979. The next prime is 21150989. The reversal of 21150984 is 48905112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21150979) and next prime (21150989).

It is not an unprimeable number, because it can be changed into a prime (21150989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18607 + ... + 19710.

It is an arithmetic number, because the mean of its divisors is an integer number (1724310).

Almost surely, 2^21150984 is an apocalyptic number.

21150984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21150984 is an abundant number, since it is smaller than the sum of its proper divisors (34026936).

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

21150984 is a wasteful number, since it uses less digits than its factorization.

21150984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38349 (or 38345 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21150984 is about 4599.0198955864. The cubic root of 21150984 is about 276.5520352196.

The spelling of 21150984 in words is "twenty-one million, one hundred fifty thousand, nine hundred eighty-four".