21050425 has 24 divisors (see below), whose sum is σ = 29185632. Its totient is φ = 14928000.

The previous prime is 21050417. The next prime is 21050443. The reversal of 21050425 is 52405012.

It is not a de Polignac number, because 21050425 - 2³ = 21050417 is a prime.

It is a Duffinian 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, 10342 + ... + 12208.

It is an arithmetic number, because the mean of its divisors is an integer number (1216068).

Almost surely, 2^21050425 is an apocalyptic number.

21050425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21050425 is a deficient number, since it is larger than the sum of its proper divisors (8135207).

21050425 is a wasteful number, since it uses less digits than its factorization.

21050425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929 (or 1924 counting only the distinct ones).

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

The square root of 21050425 is about 4588.0742147441. The cubic root of 21050425 is about 276.1130645424.

Adding to 21050425 its reverse (52405012), we get a palindrome (73455437).

The spelling of 21050425 in words is "twenty-one million, fifty thousand, four hundred twenty-five".