21003045650 has 12 divisors (see below), whose sum is σ = 39065665002. Its totient is φ = 8401218240.

The previous prime is 21003045619. The next prime is 21003045673. The reversal of 21003045650 is 5654030012.

It can be written as a sum of positive squares in 3 ways, for example, as 15758534089 + 5244511561 = 125533^2 + 72419^2 .

It is a super-2 number, since 2×21003045650² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210030407 + ... + 210030506.

Almost surely, 2^21003045650 is an apocalyptic number.

21003045650 is a deficient number, since it is larger than the sum of its proper divisors (18062619352).

21003045650 is a wasteful number, since it uses less digits than its factorization.

21003045650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420060925 (or 420060920 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21003045650 its reverse (5654030012), we get a palindrome (26657075662).

The spelling of 21003045650 in words is "twenty-one billion, three million, forty-five thousand, six hundred fifty".