21021013435425 has 48 divisors (see below), whose sum is σ = 34788304001280. Its totient is φ = 11200383360000.

The previous prime is 21021013435351. The next prime is 21021013435427. The reversal of 21021013435425 is 52453431012012.

It is not a de Polignac number, because 21021013435425 - 2²⁵ = 21020979880993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021013435427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1155563080 + ... + 1155581270.

It is an arithmetic number, because the mean of its divisors is an integer number (724756333360).

Almost surely, 2^{21021013435425} is an apocalyptic number.

21021013435425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21021013435425 is a deficient number, since it is larger than the sum of its proper divisors (13767290565855).

21021013435425 is a wasteful number, since it uses less digits than its factorization.

21021013435425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32234 (or 32229 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21021013435425 its reverse (52453431012012), we get a palindrome (73474444447437).

The spelling of 21021013435425 in words is "twenty-one trillion, twenty-one billion, thirteen million, four hundred thirty-five thousand, four hundred twenty-five".