21838849396 has 36 divisors (see below), whose sum is σ = 47877483108. Its totient is φ = 8639543808.

The previous prime is 21838849381. The next prime is 21838849399. The reversal of 21838849396 is 69394883812.

It can be written as a sum of positive squares in 2 ways, for example, as 4704039396 + 17134810000 = 68586^2 + 130900^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21838849399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4282941 + ... + 4288036.

Almost surely, 2^21838849396 is an apocalyptic number.

21838849396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21838849396 is an abundant number, since it is smaller than the sum of its proper divisors (26038633712).

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

21838849396 is a wasteful number, since it uses less digits than its factorization.

21838849396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8571008 (or 8570999 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 61.

The spelling of 21838849396 in words is "twenty-one billion, eight hundred thirty-eight million, eight hundred forty-nine thousand, three hundred ninety-six".