21028950 has 96 divisors (see below), whose sum is σ = 59653920. Its totient is φ = 5443200.

The previous prime is 21028939. The next prime is 21028979. The reversal of 21028950 is 5982012.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49740 + ... + 50160.

It is an arithmetic number, because the mean of its divisors is an integer number (621395).

Almost surely, 2^21028950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21028950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29826960).

21028950 is an abundant number, since it is smaller than the sum of its proper divisors (38624970).

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

21028950 is a wasteful number, since it uses less digits than its factorization.

21028950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 21028950 is about 4585.7333110420. The cubic root of 21028950 is about 276.0191385594.

The spelling of 21028950 in words is "twenty-one million, twenty-eight thousand, nine hundred fifty".