21211233489 has 48 divisors (see below), whose sum is σ = 34168148352. Its totient is φ = 12611157504.

The previous prime is 21211233467. The next prime is 21211233499. The reversal of 21211233489 is 98433211212.

It is not a de Polignac number, because 21211233489 - 2⁸ = 21211233233 is a prime.

It is a super-2 number, since 2×21211233489² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21211233419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 348367 + ... + 404699.

It is an arithmetic number, because the mean of its divisors is an integer number (711836424).

Almost surely, 2^21211233489 is an apocalyptic number.

It is an amenable number.

21211233489 is a deficient number, since it is larger than the sum of its proper divisors (12956914863).

21211233489 is a wasteful number, since it uses less digits than its factorization.

21211233489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56486 (or 56483 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The spelling of 21211233489 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-three thousand, four hundred eighty-nine".