21150216301366 has 4 divisors (see below), whose sum is σ = 31725324452052. Its totient is φ = 10575108150682.

The previous prime is 21150216301261. The next prime is 21150216301531. The reversal of 21150216301366 is 66310361205112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5287554075340 + ... + 5287554075343.

It is an arithmetic number, because the mean of its divisors is an integer number (7931331113013).

Almost surely, 2^{21150216301366} is an apocalyptic number.

21150216301366 is a deficient number, since it is larger than the sum of its proper divisors (10575108150686).

21150216301366 is a wasteful number, since it uses less digits than its factorization.

21150216301366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10575108150685.

The product of its (nonzero) digits is 38880, while the sum is 37.

Adding to 21150216301366 its reverse (66310361205112), we get a palindrome (87460577506478).

The spelling of 21150216301366 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, three hundred one thousand, three hundred sixty-six".