21010425 has 12 divisors (see below), whose sum is σ = 34737360. Its totient is φ = 11205520.

The previous prime is 21010411. The next prime is 21010427. The reversal of 21010425 is 52401012.

It is not a de Polignac number, because 21010425 - 2⁶ = 21010361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21010427) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 139995 + ... + 140144.

It is an arithmetic number, because the mean of its divisors is an integer number (2894780).

Almost surely, 2^21010425 is an apocalyptic number.

21010425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21010425 is a deficient number, since it is larger than the sum of its proper divisors (13726935).

21010425 is a wasteful number, since it uses less digits than its factorization.

21010425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280152 (or 280147 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21010425 is about 4583.7130145767. The cubic root of 21010425 is about 275.9380637119.

Adding to 21010425 its reverse (52401012), we get a palindrome (73411437).

The spelling of 21010425 in words is "twenty-one million, ten thousand, four hundred twenty-five".