21455002514011 has 4 divisors (see below), whose sum is σ = 23405457288024. Its totient is φ = 19504547740000.

The previous prime is 21455002513999. The next prime is 21455002514039. The reversal of 21455002514011 is 11041520055412.

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 21455002514011 - 2²⁷ = 21454868296283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455002514051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975227386990 + ... + 975227387011.

It is an arithmetic number, because the mean of its divisors is an integer number (5851364322006).

Almost surely, 2^{21455002514011} is an apocalyptic number.

21455002514011 is a deficient number, since it is larger than the sum of its proper divisors (1950454774013).

21455002514011 is a wasteful number, since it uses less digits than its factorization.

21455002514011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950454774012.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 21455002514011 its reverse (11041520055412), we get a palindrome (32496522569423).

The spelling of 21455002514011 in words is "twenty-one trillion, four hundred fifty-five billion, two million, five hundred fourteen thousand, eleven".