21821212469 has 8 divisors (see below), whose sum is σ = 24952498368. Its totient is φ = 18693419040.

The previous prime is 21821212453. The next prime is 21821212493. The reversal of 21821212469 is 96421212812.

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

It is a cyclic number.

It is not a de Polignac number, because 21821212469 - 2⁴ = 21821212453 is a prime.

It is a super-2 number, since 2×21821212469² (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 (21821212069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859712 + ... + 884729.

It is an arithmetic number, because the mean of its divisors is an integer number (3119062296).

Almost surely, 2^21821212469 is an apocalyptic number.

It is an amenable number.

21821212469 is a deficient number, since it is larger than the sum of its proper divisors (3131285899).

21821212469 is a wasteful number, since it uses less digits than its factorization.

21821212469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746235.

The product of its digits is 27648, while the sum is 38.

The spelling of 21821212469 in words is "twenty-one billion, eight hundred twenty-one million, two hundred twelve thousand, four hundred sixty-nine".