21213244395 has 144 divisors (see below), whose sum is σ = 44003662560. Its totient is φ = 9420945408.

The previous prime is 21213244369. The next prime is 21213244421. The reversal of 21213244395 is 59344231212.

21213244395 is a `hidden beast` number, since 2 + 1 + 21 + 3 + 244 + 395 = 666.

It is an interprime number because it is at equal distance from previous prime (21213244369) and next prime (21213244421).

It is not a de Polignac number, because 21213244395 - 2¹³ = 21213236203 is a prime.

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 21712147 + ... + 21713123.

It is an arithmetic number, because the mean of its divisors is an integer number (305580990).

Almost surely, 2^21213244395 is an apocalyptic number.

21213244395 is an abundant number, since it is smaller than the sum of its proper divisors (22790418165).

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

21213244395 is a wasteful number, since it uses less digits than its factorization.

21213244395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274 (or 1264 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The spelling of 21213244395 in words is "twenty-one billion, two hundred thirteen million, two hundred forty-four thousand, three hundred ninety-five".