21143517874 has 8 divisors (see below), whose sum is σ = 32452841520. Its totient is φ = 10325904036.

The previous prime is 21143517869. The next prime is 21143517877. The reversal of 21143517874 is 47871534112.

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

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 21143517874.

It is not an unprimeable number, because it can be changed into a prime (21143517877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122927344 + ... + 122927515.

It is an arithmetic number, because the mean of its divisors is an integer number (4056605190).

Almost surely, 2^21143517874 is an apocalyptic number.

21143517874 is a deficient number, since it is larger than the sum of its proper divisors (11309323646).

21143517874 is a wasteful number, since it uses less digits than its factorization.

21143517874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245854904.

The product of its digits is 188160, while the sum is 43.

The spelling of 21143517874 in words is "twenty-one billion, one hundred forty-three million, five hundred seventeen thousand, eight hundred seventy-four".