21115530223142 has 16 divisors (see below), whose sum is σ = 33960942135360. Its totient is φ = 9810938836608.

The previous prime is 21115530223061. The next prime is 21115530223163. The reversal of 21115530223142 is 24132203551112.

It is a junction number, because it is equal to n+sod(n) for n = 21115530223099 and 21115530223108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3930661913 + ... + 3930667284.

It is an arithmetic number, because the mean of its divisors is an integer number (2122558883460).

Almost surely, 2^{21115530223142} is an apocalyptic number.

21115530223142 is a deficient number, since it is larger than the sum of its proper divisors (12845411912218).

21115530223142 is a wasteful number, since it uses less digits than its factorization.

21115530223142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861329295.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21115530223142 its reverse (24132203551112), we get a palindrome (45247733774254).

The spelling of 21115530223142 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, two hundred twenty-three thousand, one hundred forty-two".