21003042010 has 16 divisors (see below), whose sum is σ = 37807344072. Its totient is φ = 8400801600.

The previous prime is 21003041993. The next prime is 21003042059. The reversal of 21003042010 is 1024030012.

It can be written as a sum of positive squares in 4 ways, for example, as 15920635329 + 5082406681 = 126177^2 + 71291^2 .

It is a super-2 number, since 2×21003042010² (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 7 ways as a sum of consecutive naturals, for example, 237280 + ... + 313540.

Almost surely, 2^21003042010 is an apocalyptic number.

21003042010 is a deficient number, since it is larger than the sum of its proper divisors (16804302062).

21003042010 is a wasteful number, since it uses less digits than its factorization.

21003042010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103809.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21003042010 its reverse (1024030012), we get a palindrome (22027072022).

The spelling of 21003042010 in words is "twenty-one billion, three million, forty-two thousand, ten".