21214036421236 has 24 divisors (see below), whose sum is σ = 38662470945000. Its totient is φ = 10172525672064.

The previous prime is 21214036421203. The next prime is 21214036421317. The reversal of 21214036421236 is 63212463041212.

21214036421236 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4678785302500 + 16535251118736 = 2163050^2 + 4066356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21214036421195 and 21214036421204.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 613672731 + ... + 613707298.

It is an arithmetic number, because the mean of its divisors is an integer number (1610936289375).

Almost surely, 2^{21214036421236} is an apocalyptic number.

It is an amenable number.

21214036421236 is a deficient number, since it is larger than the sum of its proper divisors (17448434523764).

21214036421236 is a wasteful number, since it uses less digits than its factorization.

21214036421236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227380211 (or 1227380209 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 21214036421236 its reverse (63212463041212), we get a palindrome (84426499462448).

The spelling of 21214036421236 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, four hundred twenty-one thousand, two hundred thirty-six".