21141425 has 6 divisors (see below), whose sum is σ = 26215398. Its totient is φ = 16913120.

The previous prime is 21141403. The next prime is 21141431. The reversal of 21141425 is 52414112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3869089 + 17272336 = 1967^2 + 4156^2 .

It is not a de Polignac number, because 21141425 - 2⁶ = 21141361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21141397 and 21141406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 422804 + ... + 422853.

It is an arithmetic number, because the mean of its divisors is an integer number (4369233).

Almost surely, 2^21141425 is an apocalyptic number.

21141425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21141425 is a deficient number, since it is larger than the sum of its proper divisors (5073973).

21141425 is an equidigital number, since it uses as much as digits as its factorization.

21141425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845667 (or 845662 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 21141425 is about 4597.9805349740. The cubic root of 21141425 is about 276.5103671937.

Adding to 21141425 its reverse (52414112), we get a palindrome (73555537).

The spelling of 21141425 in words is "twenty-one million, one hundred forty-one thousand, four hundred twenty-five".