21003031011 has 8 divisors (see below), whose sum is σ = 28217813184. Its totient is φ = 13895134760.

The previous prime is 21003031001. The next prime is 21003031031. The reversal of 21003031011 is 11013030012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003031011 - 2⁶ = 21003030947 is a prime.

It is a super-2 number, since 2×21003031011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003031001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26721021 + ... + 26721806.

It is an arithmetic number, because the mean of its divisors is an integer number (3527226648).

Almost surely, 2^21003031011 is an apocalyptic number.

21003031011 is a deficient number, since it is larger than the sum of its proper divisors (7214782173).

21003031011 is a wasteful number, since it uses less digits than its factorization.

21003031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53442961.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21003031011 its reverse (11013030012), we get a palindrome (32016061023).

Subtracting from 21003031011 its reverse (11013030012), we obtain a palindrome (9990000999).

The spelling of 21003031011 in words is "twenty-one billion, three million, thirty-one thousand, eleven".