21260003545 has 16 divisors (see below), whose sum is σ = 29296082880. Its totient is φ = 14648040000.

The previous prime is 21260003533. The next prime is 21260003549. The reversal of 21260003545 is 54530006212.

It is not a de Polignac number, because 21260003545 - 2²¹ = 21257906393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21260003549) 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 15 ways as a sum of consecutive naturals, for example, 10171206 + ... + 10173295.

It is an arithmetic number, because the mean of its divisors is an integer number (1831005180).

Almost surely, 2^21260003545 is an apocalyptic number.

It is an amenable number.

21260003545 is a deficient number, since it is larger than the sum of its proper divisors (8036079335).

21260003545 is a wasteful number, since it uses less digits than its factorization.

21260003545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20344536.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21260003545 its reverse (54530006212), we get a palindrome (75790009757).

The spelling of 21260003545 in words is "twenty-one billion, two hundred sixty million, three thousand, five hundred forty-five".