215210116007021 has 4 divisors (see below), whose sum is σ = 215254297928544. Its totient is φ = 215165934085500.

The previous prime is 215210116006993. The next prime is 215210116007041. The reversal of 215210116007021 is 120700611012512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215210116007021 - 2²⁶ = 215210048898157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215210116007041) 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, 22090953455 + ... + 22090963196.

It is an arithmetic number, because the mean of its divisors is an integer number (53813574482136).

Almost surely, 2^{215210116007021} is an apocalyptic number.

It is an amenable number.

215210116007021 is a deficient number, since it is larger than the sum of its proper divisors (44181921523).

215210116007021 is an equidigital number, since it uses as much as digits as its factorization.

215210116007021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44181921522.

The product of its (nonzero) digits is 1680, while the sum is 29.

Adding to 215210116007021 its reverse (120700611012512), we get a palindrome (335910727019533).

The spelling of 215210116007021 in words is "two hundred fifteen trillion, two hundred ten billion, one hundred sixteen million, seven thousand, twenty-one".