21219999999 has 32 divisors (see below), whose sum is σ = 32159047680. Its totient is φ = 12329368800.

The previous prime is 21219999979. The next prime is 21220000001. The reversal of 21219999999 is 99999991212.

It is not a de Polignac number, because 21219999999 - 2⁹ = 21219999487 is a prime.

21219999999 is a modest number, since divided by 999999 gives 21219 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219999929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12532 + ... + 206390.

It is an arithmetic number, because the mean of its divisors is an integer number (1004970240).

Almost surely, 2^21219999999 is an apocalyptic number.

21219999999 is a deficient number, since it is larger than the sum of its proper divisors (10939047681).

21219999999 is a wasteful number, since it uses less digits than its factorization.

21219999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194011.

The product of its digits is 19131876, while the sum is 69.

The spelling of 21219999999 in words is "twenty-one billion, two hundred nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-nine".