21116151515054 has 32 divisors (see below), whose sum is σ = 31900719244800. Its totient is φ = 10482811191072.

The previous prime is 21116151515029. The next prime is 21116151515057. The reversal of 21116151515054 is 45051515161112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21116151514999 and 21116151515017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116151515057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1719970364 + ... + 1719982640.

It is an arithmetic number, because the mean of its divisors is an integer number (996897476400).

Almost surely, 2^{21116151515054} is an apocalyptic number.

21116151515054 is a deficient number, since it is larger than the sum of its proper divisors (10784567729746).

21116151515054 is a wasteful number, since it uses less digits than its factorization.

21116151515054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21264.

The product of its (nonzero) digits is 30000, while the sum is 38.

Adding to 21116151515054 its reverse (45051515161112), we get a palindrome (66167666676166).

The spelling of 21116151515054 in words is "twenty-one trillion, one hundred sixteen billion, one hundred fifty-one million, five hundred fifteen thousand, fifty-four".