21219898469 has 16 divisors (see below), whose sum is σ = 26468539776. Its totient is φ = 16527134400.

The previous prime is 21219898397. The next prime is 21219898471. The reversal of 21219898469 is 96489891212.

It is not a de Polignac number, because 21219898469 - 2³² = 16924931173 is a prime.

It is a super-2 number, since 2×21219898469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219898499) 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 15 ways as a sum of consecutive naturals, for example, 100499 + ... + 229215.

It is an arithmetic number, because the mean of its divisors is an integer number (1654283736).

Almost surely, 2^21219898469 is an apocalyptic number.

It is an amenable number.

21219898469 is a deficient number, since it is larger than the sum of its proper divisors (5248641307).

21219898469 is a wasteful number, since it uses less digits than its factorization.

21219898469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130876.

The product of its digits is 4478976, while the sum is 59.

The spelling of 21219898469 in words is "twenty-one billion, two hundred nineteen million, eight hundred ninety-eight thousand, four hundred sixty-nine".