21150248 has 32 divisors (see below), whose sum is σ = 47295360. Its totient is φ = 8669760.

The previous prime is 21150247. The next prime is 21150253. The reversal of 21150248 is 84205112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21150247) 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, 6923 + ... + 9498.

It is an arithmetic number, because the mean of its divisors is an integer number (1477980).

Almost surely, 2^21150248 is an apocalyptic number.

21150248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21150248 is an abundant number, since it is smaller than the sum of its proper divisors (26145112).

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

21150248 is a wasteful number, since it uses less digits than its factorization.

21150248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16457 (or 16453 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21150248 is about 4598.9398778414. The cubic root of 21150248 is about 276.5488274152.

The spelling of 21150248 in words is "twenty-one million, one hundred fifty thousand, two hundred forty-eight".