21895950 has 48 divisors (see below), whose sum is σ = 55215216. Its totient is φ = 5740800.

The previous prime is 21895933. The next prime is 21895969. The reversal of 21895950 is 5959812.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21895899 and 21895908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7954 + ... + 10346.

It is an arithmetic number, because the mean of its divisors is an integer number (1150317).

Almost surely, 2^21895950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21895950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27607608).

21895950 is an abundant number, since it is smaller than the sum of its proper divisors (33319266).

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

21895950 is a wasteful number, since it uses less digits than its factorization.

21895950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469 (or 2464 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 21895950 is about 4679.3108466953. The cubic root of 21895950 is about 279.7614890650.

The spelling of 21895950 in words is "twenty-one million, eight hundred ninety-five thousand, nine hundred fifty".