21835139925 has 48 divisors (see below), whose sum is σ = 36605657088. Its totient is φ = 11483083200.

The previous prime is 21835139873. The next prime is 21835139927. The reversal of 21835139925 is 52993153812.

It is not a de Polignac number, because 21835139925 - 2⁹ = 21835139413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835139927) 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, 3551404 + ... + 3557546.

It is an arithmetic number, because the mean of its divisors is an integer number (762617856).

Almost surely, 2^21835139925 is an apocalyptic number.

21835139925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21835139925 is a deficient number, since it is larger than the sum of its proper divisors (14770517163).

21835139925 is a wasteful number, since it uses less digits than its factorization.

21835139925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810 (or 6805 counting only the distinct ones).

The product of its digits is 583200, while the sum is 48.

The spelling of 21835139925 in words is "twenty-one billion, eight hundred thirty-five million, one hundred thirty-nine thousand, nine hundred twenty-five".