21130003545 has 32 divisors (see below), whose sum is σ = 40910531328. Its totient is φ = 9091227648.

The previous prime is 21130003541. The next prime is 21130003571. The reversal of 21130003545 is 54530003112.

It is not a de Polignac number, because 21130003545 - 2² = 21130003541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21130003541) 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 31 ways as a sum of consecutive naturals, for example, 5916984 + ... + 5920553.

It is an arithmetic number, because the mean of its divisors is an integer number (1278454104).

Almost surely, 2^21130003545 is an apocalyptic number.

It is an amenable number.

21130003545 is a deficient number, since it is larger than the sum of its proper divisors (19780527783).

21130003545 is a wasteful number, since it uses less digits than its factorization.

21130003545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11837569.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21130003545 its reverse (54530003112), we get a palindrome (75660006657).

The spelling of 21130003545 in words is "twenty-one billion, one hundred thirty million, three thousand, five hundred forty-five".