21213543315142 has 16 divisors (see below), whose sum is σ = 33692936891040. Its totient is φ = 9982595413888.

The previous prime is 21213543315073. The next prime is 21213543315143. The reversal of 21213543315142 is 24151334531212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213543315143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6376042 + ... + 9114877.

It is an arithmetic number, because the mean of its divisors is an integer number (2105808555690).

Almost surely, 2^{21213543315142} is an apocalyptic number.

21213543315142 is a deficient number, since it is larger than the sum of its proper divisors (12479393575898).

21213543315142 is a wasteful number, since it uses less digits than its factorization.

21213543315142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15531215.

The product of its digits is 86400, while the sum is 37.

Adding to 21213543315142 its reverse (24151334531212), we get a palindrome (45364877846354).

The spelling of 21213543315142 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand, one hundred forty-two".