21034950 has 96 divisors (see below), whose sum is σ = 56487456. Its totient is φ = 5160960.

The previous prime is 21034943. The next prime is 21034963. The reversal of 21034950 is 5943012.

It is a self number, because there is not a number n which added to its sum of digits gives 21034950.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186094 + ... + 186206.

It is an arithmetic number, because the mean of its divisors is an integer number (588411).

Almost surely, 2^21034950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28243728).

21034950 is an abundant number, since it is smaller than the sum of its proper divisors (35452506).

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

21034950 is a wasteful number, since it uses less digits than its factorization.

21034950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 213 counting only the distinct ones).

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

The square root of 21034950 is about 4586.3874672775. The cubic root of 21034950 is about 276.0453874108.

Adding to 21034950 its reverse (5943012), we get a palindrome (26977962).

The spelling of 21034950 in words is "twenty-one million, thirty-four thousand, nine hundred fifty".