21145142243254 has 8 divisors (see below), whose sum is σ = 33583461209928. Its totient is φ = 9950655173280.

The previous prime is 21145142243227. The next prime is 21145142243279. The reversal of 21145142243254 is 45234224154112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310957974132 + ... + 310957974199.

It is an arithmetic number, because the mean of its divisors is an integer number (4197932651241).

Almost surely, 2^{21145142243254} is an apocalyptic number.

21145142243254 is a deficient number, since it is larger than the sum of its proper divisors (12438318966674).

21145142243254 is a wasteful number, since it uses less digits than its factorization.

21145142243254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621915948350.

The product of its digits is 307200, while the sum is 40.

Adding to 21145142243254 its reverse (45234224154112), we get a palindrome (66379366397366).

The spelling of 21145142243254 in words is "twenty-one trillion, one hundred forty-five billion, one hundred forty-two million, two hundred forty-three thousand, two hundred fifty-four".