21214051246351 has 4 divisors (see below), whose sum is σ = 21214105859232. Its totient is φ = 21213996633472.

The previous prime is 21214051246313. The next prime is 21214051246369. The reversal of 21214051246351 is 15364215041212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21214051246351 - 2¹⁵ = 21214051213583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21214051246351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214051246391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26719570 + ... + 27502063.

It is an arithmetic number, because the mean of its divisors is an integer number (5303526464808).

Almost surely, 2^{21214051246351} is an apocalyptic number.

21214051246351 is a deficient number, since it is larger than the sum of its proper divisors (54612881).

21214051246351 is an equidigital number, since it uses as much as digits as its factorization.

21214051246351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54612880.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 21214051246351 its reverse (15364215041212), we get a palindrome (36578266287563).

The spelling of 21214051246351 in words is "twenty-one trillion, two hundred fourteen billion, fifty-one million, two hundred forty-six thousand, three hundred fifty-one".