21515050120142 has 32 divisors (see below), whose sum is σ = 33052870683360. Its totient is φ = 10497880391040.

The previous prime is 21515050120139. The next prime is 21515050120159. The reversal of 21515050120142 is 24102105051512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899860484 + ... + 899884392.

It is an arithmetic number, because the mean of its divisors is an integer number (1032902208855).

Almost surely, 2^{21515050120142} is an apocalyptic number.

21515050120142 is a deficient number, since it is larger than the sum of its proper divisors (11537820563218).

21515050120142 is a wasteful number, since it uses less digits than its factorization.

21515050120142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32948.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 21515050120142 its reverse (24102105051512), we get a palindrome (45617155171654).

The spelling of 21515050120142 in words is "twenty-one trillion, five hundred fifteen billion, fifty million, one hundred twenty thousand, one hundred forty-two".