21019019211 has 32 divisors (see below), whose sum is σ = 32949964800. Its totient is φ = 13205604960.

The previous prime is 21019019209. The next prime is 21019019261. The reversal of 21019019211 is 11291091012.

It is not a de Polignac number, because 21019019211 - 2¹ = 21019019209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21019019261) 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 31 ways as a sum of consecutive naturals, for example, 9276 + ... + 205241.

It is an arithmetic number, because the mean of its divisors is an integer number (1029686400).

Almost surely, 2^21019019211 is an apocalyptic number.

21019019211 is a deficient number, since it is larger than the sum of its proper divisors (11930945589).

21019019211 is a wasteful number, since it uses less digits than its factorization.

21019019211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214736 (or 214730 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

It can be divided in two parts, 2101901 and 9211, that added together give a palindrome (2111112).

The spelling of 21019019211 in words is "twenty-one billion, nineteen million, nineteen thousand, two hundred eleven".