21240203002 has 16 divisors (see below), whose sum is σ = 33960853800. Its totient is φ = 9928304128.

The previous prime is 21240202937. The next prime is 21240203021. The reversal of 21240203002 is 20030204212.

It can be written as a sum of positive squares in 4 ways, for example, as 10778800041 + 10461402961 = 103821^2 + 102281^2 .

It is a super-2 number, since 2×21240203002² (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, 2091283 + ... + 2101414.

Almost surely, 2^21240203002 is an apocalyptic number.

21240203002 is a deficient number, since it is larger than the sum of its proper divisors (12720650798).

21240203002 is a wasteful number, since it uses less digits than its factorization.

21240203002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192865.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21240203002 its reverse (20030204212), we get a palindrome (41270407214).

The spelling of 21240203002 in words is "twenty-one billion, two hundred forty million, two hundred three thousand, two".