21040525641 has 16 divisors (see below), whose sum is σ = 28209920768. Its totient is φ = 13949182800.

The previous prime is 21040525637. The next prime is 21040525657. The reversal of 21040525641 is 14652504012.

It is not a de Polignac number, because 21040525641 - 2² = 21040525637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21040525599 and 21040525608.

It is not an unprimeable number, because it can be changed into a prime (21040525631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804330 + ... + 830076.

It is an arithmetic number, because the mean of its divisors is an integer number (1763120048).

Almost surely, 2^21040525641 is an apocalyptic number.

It is an amenable number.

21040525641 is a deficient number, since it is larger than the sum of its proper divisors (7169395127).

21040525641 is a wasteful number, since it uses less digits than its factorization.

21040525641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27252.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21040525641 in words is "twenty-one billion, forty million, five hundred twenty-five thousand, six hundred forty-one".