21214036536678 has 40 divisors (see below), whose sum is σ = 47636944455672. Its totient is φ = 7056203419584.

The previous prime is 21214036536677. The next prime is 21214036536689. The reversal of 21214036536678 is 87663563041212.

21214036536678 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 4 + 0 + 36 + 536 + 6 + 78 = 666.

It is a super-2 number, since 2×21214036536678² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 140128675 + ... + 140279982.

Almost surely, 2^{21214036536678} is an apocalyptic number.

21214036536678 is an abundant number, since it is smaller than the sum of its proper divisors (26422907918994).

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

21214036536678 is a wasteful number, since it uses less digits than its factorization.

21214036536678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280409138 (or 280409129 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 21214036536678 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred seventy-eight".