21214051240665 has 8 divisors (see below), whose sum is σ = 33942481985088. Its totient is φ = 11314160661680.

The previous prime is 21214051240651. The next prime is 21214051240703. The reversal of 21214051240665 is 56604215041212.

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

It is not a de Polignac number, because 21214051240665 - 2⁵ = 21214051240633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707135041341 + ... + 707135041370.

It is an arithmetic number, because the mean of its divisors is an integer number (4242810248136).

Almost surely, 2^{21214051240665} is an apocalyptic number.

It is an amenable number.

21214051240665 is a deficient number, since it is larger than the sum of its proper divisors (12728430744423).

21214051240665 is a wasteful number, since it uses less digits than its factorization.

21214051240665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414270082719.

The product of its (nonzero) digits is 115200, while the sum is 39.

Adding to 21214051240665 its reverse (56604215041212), we get a palindrome (77818266281877).

The spelling of 21214051240665 in words is "twenty-one trillion, two hundred fourteen billion, fifty-one million, two hundred forty thousand, six hundred sixty-five".