21515050142151 has 16 divisors (see below), whose sum is σ = 28791195878400. Its totient is φ = 14291138822688.

The previous prime is 21515050142119. The next prime is 21515050142191. The reversal of 21515050142151 is 15124105051512.

It is a happy number.

It is not a de Polignac number, because 21515050142151 - 2⁵ = 21515050142119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515050142191) 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, 27333270 + ... + 28109388.

It is an arithmetic number, because the mean of its divisors is an integer number (1799449742400).

Almost surely, 2^{21515050142151} is an apocalyptic number.

21515050142151 is a deficient number, since it is larger than the sum of its proper divisors (7276145736249).

21515050142151 is a wasteful number, since it uses less digits than its factorization.

21515050142151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809758.

The product of its (nonzero) digits is 10000, while the sum is 33.

Adding to 21515050142151 its reverse (15124105051512), we get a palindrome (36639155193663).

The spelling of 21515050142151 in words is "twenty-one trillion, five hundred fifteen billion, fifty million, one hundred forty-two thousand, one hundred fifty-one".