21103946285 has 48 divisors (see below), whose sum is σ = 28370393856. Its totient is φ = 15016306176.

The previous prime is 21103946273. The next prime is 21103946287. The reversal of 21103946285 is 58264930112.

It is a de Polignac number, because none of the positive numbers 2^k-21103946285 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103946287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19852664 + ... + 19853726.

It is an arithmetic number, because the mean of its divisors is an integer number (591049872).

Almost surely, 2^21103946285 is an apocalyptic number.

It is an amenable number.

21103946285 is a deficient number, since it is larger than the sum of its proper divisors (7266447571).

21103946285 is a wasteful number, since it uses less digits than its factorization.

21103946285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 21103946285 in words is "twenty-one billion, one hundred three million, nine hundred forty-six thousand, two hundred eighty-five".