21366420430151 has 4 divisors (see below), whose sum is σ = 21477127271952. Its totient is φ = 21255713588352.

The previous prime is 21366420430099. The next prime is 21366420430171. The reversal of 21366420430151 is 15103402466312.

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 21366420430151 - 2²² = 21366416235847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366420430171) 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, 55353420611 + ... + 55353420996.

It is an arithmetic number, because the mean of its divisors is an integer number (5369281817988).

Almost surely, 2^{21366420430151} is an apocalyptic number.

21366420430151 is a deficient number, since it is larger than the sum of its proper divisors (110706841801).

21366420430151 is a wasteful number, since it uses less digits than its factorization.

21366420430151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110706841800.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 21366420430151 its reverse (15103402466312), we get a palindrome (36469822896463).

The spelling of 21366420430151 in words is "twenty-one trillion, three hundred sixty-six billion, four hundred twenty million, four hundred thirty thousand, one hundred fifty-one".