21214036421206 has 8 divisors (see below), whose sum is σ = 31827427780104. Its totient is φ = 10604893827840.

The previous prime is 21214036421203. The next prime is 21214036421317. The reversal of 21214036421206 is 60212463041212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036421203) 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 3 ways as a sum of consecutive naturals, for example, 1062178900 + ... + 1062198871.

It is an arithmetic number, because the mean of its divisors is an integer number (3978428472513).

Almost surely, 2^{21214036421206} is an apocalyptic number.

21214036421206 is a deficient number, since it is larger than the sum of its proper divisors (10613391358898).

21214036421206 is a wasteful number, since it uses less digits than its factorization.

21214036421206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124382766.

The product of its (nonzero) digits is 27648, while the sum is 34.

Adding to 21214036421206 its reverse (60212463041212), we get a palindrome (81426499462418).

The spelling of 21214036421206 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, four hundred twenty-one thousand, two hundred six".