21062425 has 6 divisors (see below), whose sum is σ = 26117438. Its totient is φ = 16849920.

The previous prime is 21062413. The next prime is 21062429. The reversal of 21062425 is 52426012.

It can be written as a sum of positive squares in 3 ways, for example, as 4309776 + 16752649 = 2076^2 + 4093^2 .

It is not a de Polignac number, because 21062425 - 2⁷ = 21062297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21062396 and 21062405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421224 + ... + 421273.

Almost surely, 2^21062425 is an apocalyptic number.

21062425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21062425 is a deficient number, since it is larger than the sum of its proper divisors (5055013).

21062425 is an equidigital number, since it uses as much as digits as its factorization.

21062425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842507 (or 842502 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21062425 is about 4589.3817666435. The cubic root of 21062425 is about 276.1655215572.

Adding to 21062425 its reverse (52426012), we get a palindrome (73488437).

The spelling of 21062425 in words is "twenty-one million, sixty-two thousand, four hundred twenty-five".