21212774842284 has 120 divisors (see below), whose sum is σ = 55713142634688. Its totient is φ = 7038003466080.

The previous prime is 21212774842283. The next prime is 21212774842289. The reversal of 21212774842284 is 48224847721212.

21212774842284 is a `hidden beast` number, since 2 + 1 + 2 + 12 + 77 + 484 + 2 + 2 + 84 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21212774842284.

It is not an unprimeable number, because it can be changed into a prime (21212774842283) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63129399 + ... + 63464529.

Almost surely, 2^{21212774842284} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212774842284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27856571317344).

21212774842284 is an abundant number, since it is smaller than the sum of its proper divisors (34500367792404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212774842284 is a wasteful number, since it uses less digits than its factorization.

21212774842284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336057 (or 336046 counting only the distinct ones).

The product of its digits is 6422528, while the sum is 54.

The spelling of 21212774842284 in words is "twenty-one trillion, two hundred twelve billion, seven hundred seventy-four million, eight hundred forty-two thousand, two hundred eighty-four".