21150354025 has 12 divisors (see below), whose sum is σ = 26291854044. Its totient is φ = 16878080000.

The previous prime is 21150354023. The next prime is 21150354061. The reversal of 21150354025 is 52045305112.

It can be written as a sum of positive squares in 6 ways, for example, as 104468841 + 21045885184 = 10221^2 + 145072^2 .

It is not a de Polignac number, because 21150354025 - 2¹ = 21150354023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21150353984 and 21150354002.

It is not an unprimeable number, because it can be changed into a prime (21150354023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1044856 + ... + 1064905.

It is an arithmetic number, because the mean of its divisors is an integer number (2190987837).

Almost surely, 2^21150354025 is an apocalyptic number.

21150354025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21150354025 is a deficient number, since it is larger than the sum of its proper divisors (5141500019).

21150354025 is a wasteful number, since it uses less digits than its factorization.

21150354025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110172 (or 2110167 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21150354025 its reverse (52045305112), we get a palindrome (73195659137).

The spelling of 21150354025 in words is "twenty-one billion, one hundred fifty million, three hundred fifty-four thousand, twenty-five".