21953050 has 24 divisors (see below), whose sum is σ = 46666656. Its totient is φ = 7526640.

The previous prime is 21953033. The next prime is 21953051. The reversal of 21953050 is 5035912.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21953051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31012 + ... + 31711.

It is an arithmetic number, because the mean of its divisors is an integer number (1944444).

Almost surely, 2^21953050 is an apocalyptic number.

21953050 is an abundant number, since it is smaller than the sum of its proper divisors (24713606).

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

21953050 is a wasteful number, since it uses less digits than its factorization.

21953050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62742 (or 62737 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 21953050 is about 4685.4081999331. The cubic root of 21953050 is about 280.0044642145.

Adding to 21953050 its reverse (5035912), we get a palindrome (26988962).

The spelling of 21953050 in words is "twenty-one million, nine hundred fifty-three thousand, fifty".