21214036536448 has 96 divisors (see below), whose sum is σ = 52054213000140. Its totient is φ = 8556922257408.

The previous prime is 21214036536403. The next prime is 21214036536449. The reversal of 21214036536448 is 84463563041212.

It can be written as a sum of positive squares in 2 ways, for example, as 17087905597504 + 4126130938944 = 4133752^2 + 2031288^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (21214036536449) 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 11 ways as a sum of consecutive naturals, for example, 99373965 + ... + 99587212.

Almost surely, 2^{21214036536448} is an apocalyptic number.

21214036536448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21214036536448 is an abundant number, since it is smaller than the sum of its proper divisors (30840176463692).

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

21214036536448 is a wasteful number, since it uses less digits than its factorization.

21214036536448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198961222 (or 198961203 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 21214036536448 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred forty-eight".