21304950 has 48 divisors (see below), whose sum is σ = 53206416. Its totient is φ = 5641600.

The previous prime is 21304949. The next prime is 21304951. The reversal of 21304950 is 5940312.

It is an interprime number because it is at equal distance from previous prime (21304949) and next prime (21304951).

It is a self number, because there is not a number n which added to its sum of digits gives 21304950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25540 + ... + 26360.

It is an arithmetic number, because the mean of its divisors is an integer number (1108467).

Almost surely, 2^21304950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21304950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26603208).

21304950 is an abundant number, since it is smaller than the sum of its proper divisors (31901466).

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

21304950 is a wasteful number, since it uses less digits than its factorization.

21304950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21304950 is about 4615.7285448778. The cubic root of 21304950 is about 277.2214557499.

The spelling of 21304950 in words is "twenty-one million, three hundred four thousand, nine hundred fifty".