21003113211 has 8 divisors (see below), whose sum is σ = 28907510784. Its totient is φ = 13550395560.

The previous prime is 21003113177. The next prime is 21003113227. The reversal of 21003113211 is 11231130012.

It is a happy number.

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

It is not a de Polignac number, because 21003113211 - 2¹¹ = 21003111163 is a prime.

It is a super-2 number, since 2×21003113211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003113291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112919871 + ... + 112920056.

It is an arithmetic number, because the mean of its divisors is an integer number (3613438848).

Almost surely, 2^21003113211 is an apocalyptic number.

21003113211 is a deficient number, since it is larger than the sum of its proper divisors (7904397573).

21003113211 is a wasteful number, since it uses less digits than its factorization.

21003113211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225839961.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21003113211 its reverse (11231130012), we get a palindrome (32234243223).

The spelling of 21003113211 in words is "twenty-one billion, three million, one hundred thirteen thousand, two hundred eleven".