21100313425 has 24 divisors (see below), whose sum is σ = 26671427840. Its totient is φ = 16555968000.

The previous prime is 21100313389. The next prime is 21100313467. The reversal of 21100313425 is 52431300112.

It is a happy number.

It is not a de Polignac number, because 21100313425 - 2¹⁵ = 21100280657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100313396 and 21100313405.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 262849 + ... + 333601.

Almost surely, 2^21100313425 is an apocalyptic number.

21100313425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21100313425 is a deficient number, since it is larger than the sum of its proper divisors (5571114415).

21100313425 is a wasteful number, since it uses less digits than its factorization.

21100313425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70993 (or 70988 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21100313425 its reverse (52431300112), we get a palindrome (73531613537).

The spelling of 21100313425 in words is "twenty-one billion, one hundred million, three hundred thirteen thousand, four hundred twenty-five".