21002230511 has 12 divisors (see below), whose sum is σ = 22149428448. Its totient is φ = 19911253824.

The previous prime is 21002230499. The next prime is 21002230541. The reversal of 21002230511 is 11503220012.

It is a happy number.

It is not a de Polignac number, because 21002230511 - 2¹⁰ = 21002229487 is a prime.

It is a super-2 number, since 2×21002230511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002230511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002230541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115895 + ... + 235448.

It is an arithmetic number, because the mean of its divisors is an integer number (1845785704).

Almost surely, 2^21002230511 is an apocalyptic number.

21002230511 is a deficient number, since it is larger than the sum of its proper divisors (1147197937).

21002230511 is a wasteful number, since it uses less digits than its factorization.

21002230511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351502 (or 351479 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21002230511 its reverse (11503220012), we get a palindrome (32505450523).

The spelling of 21002230511 in words is "twenty-one billion, two million, two hundred thirty thousand, five hundred eleven".