21003002011 has 16 divisors (see below), whose sum is σ = 21872196864. Its totient is φ = 20150623584.

The previous prime is 21003001991. The next prime is 21003002017. The reversal of 21003002011 is 11020030012.

It is a cyclic number.

It is not a de Polignac number, because 21003002011 - 2⁵ = 21003001979 is a prime.

It is a super-4 number, since 4×21003002011⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003002017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1673586 + ... + 1686088.

It is an arithmetic number, because the mean of its divisors is an integer number (1367012304).

Almost surely, 2^21003002011 is an apocalyptic number.

21003002011 is a deficient number, since it is larger than the sum of its proper divisors (869194853).

21003002011 is a wasteful number, since it uses less digits than its factorization.

21003002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21003002011 its reverse (11020030012), we get a palindrome (32023032023).

The spelling of 21003002011 in words is "twenty-one billion, three million, two thousand, eleven".