21077425 has 12 divisors (see below), whose sum is σ = 26432460. Its totient is φ = 16670720.

The previous prime is 21077401. The next prime is 21077431. The reversal of 21077425 is 52477012.

It can be written as a sum of positive squares in 6 ways, for example, as 144 + 21077281 = 12^2 + 4591^2 .

It is not a de Polignac number, because 21077425 - 2⁵ = 21077393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21077393 and 21077402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2512 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (2202705).

Almost surely, 2^21077425 is an apocalyptic number.

21077425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21077425 is a deficient number, since it is larger than the sum of its proper divisors (5355035).

21077425 is an equidigital number, since it uses as much as digits as its factorization.

21077425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9572 (or 9567 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 21077425 is about 4591.0156828310. The cubic root of 21077425 is about 276.2310648146.

The spelling of 21077425 in words is "twenty-one million, seventy-seven thousand, four hundred twenty-five".