21744974155 has 8 divisors (see below), whose sum is σ = 26993761200. Its totient is φ = 16796117856.

The previous prime is 21744974131. The next prime is 21744974189. The reversal of 21744974155 is 55147944712.

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

It is a cyclic number.

It is not a de Polignac number, because 21744974155 - 2¹⁷ = 21744843083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21744974099 and 21744974108.

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, 74982525 + ... + 74982814.

It is an arithmetic number, because the mean of its divisors is an integer number (3374220150).

Almost surely, 2^21744974155 is an apocalyptic number.

21744974155 is a deficient number, since it is larger than the sum of its proper divisors (5248787045).

21744974155 is a wasteful number, since it uses less digits than its factorization.

21744974155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149965373.

The product of its digits is 1411200, while the sum is 49.

The spelling of 21744974155 in words is "twenty-one billion, seven hundred forty-four million, nine hundred seventy-four thousand, one hundred fifty-five".