20521301025 has 48 divisors (see below), whose sum is σ = 36247481600. Its totient is φ = 10213853760.

The previous prime is 20521301023. The next prime is 20521301093. The reversal of 20521301025 is 52010312502.

It is not a de Polignac number, because 20521301025 - 2¹ = 20521301023 is a prime.

It is a super-2 number, since 2×20521301025² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20521300992 and 20521301010.

It is not an unprimeable number, because it can be changed into a prime (20521301023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11995 + ... + 202944.

Almost surely, 2^20521301025 is an apocalyptic number.

20521301025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20521301025 is a deficient number, since it is larger than the sum of its proper divisors (15726180575).

20521301025 is a wasteful number, since it uses less digits than its factorization.

20521301025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215038 (or 215033 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 20521301025 its reverse (52010312502), we get a palindrome (72531613527).

The spelling of 20521301025 in words is "twenty billion, five hundred twenty-one million, three hundred one thousand, twenty-five".