21513250353142 has 16 divisors (see below), whose sum is σ = 32487775650000. Its totient is φ = 10683997686880.

The previous prime is 21513250353139. The next prime is 21513250353143. The reversal of 21513250353142 is 24135305231512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513250353143) 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, 5916717 + ... + 8833687.

It is an arithmetic number, because the mean of its divisors is an integer number (2030485978125).

Almost surely, 2^{21513250353142} is an apocalyptic number.

21513250353142 is a deficient number, since it is larger than the sum of its proper divisors (10974525296858).

21513250353142 is a wasteful number, since it uses less digits than its factorization.

21513250353142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941871.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 21513250353142 its reverse (24135305231512), we get a palindrome (45648555584654).

The spelling of 21513250353142 in words is "twenty-one trillion, five hundred thirteen billion, two hundred fifty million, three hundred fifty-three thousand, one hundred forty-two".