21010241425 has 24 divisors (see below), whose sum is σ = 26233743800. Its totient is φ = 16691788800.

The previous prime is 21010241423. The next prime is 21010241429. The reversal of 21010241425 is 52414201012.

It can be written as a sum of positive squares in 12 ways, for example, as 638673984 + 20371567441 = 25272^2 + 142729^2 .

It is not a de Polignac number, because 21010241425 - 2¹ = 21010241423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010241396 and 21010241405.

It is not an unprimeable number, because it can be changed into a prime (21010241423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2242651 + ... + 2251999.

Almost surely, 2^21010241425 is an apocalyptic number.

21010241425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21010241425 is a deficient number, since it is larger than the sum of its proper divisors (5223502375).

21010241425 is a wasteful number, since it uses less digits than its factorization.

21010241425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9973 (or 9968 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21010241425 its reverse (52414201012), we get a palindrome (73424442437).

The spelling of 21010241425 in words is "twenty-one billion, ten million, two hundred forty-one thousand, four hundred twenty-five".