21425050 has 24 divisors (see below), whose sum is σ = 40167072. Its totient is φ = 8502000.

The previous prime is 21425023. The next prime is 21425057. The reversal of 21425050 is 5052412.

It is not an unprimeable number, because it can be changed into a prime (21425057) 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, 4915 + ... + 8185.

It is an arithmetic number, because the mean of its divisors is an integer number (1673628).

Almost surely, 2^21425050 is an apocalyptic number.

21425050 is a deficient number, since it is larger than the sum of its proper divisors (18742022).

21425050 is a wasteful number, since it uses less digits than its factorization.

21425050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414 (or 3409 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21425050 is about 4628.7201254775. The cubic root of 21425050 is about 277.7413964204.

Adding to 21425050 its reverse (5052412), we get a palindrome (26477462).

The spelling of 21425050 in words is "twenty-one million, four hundred twenty-five thousand, fifty".