21111743474 has 4 divisors (see below), whose sum is σ = 31667615214. Its totient is φ = 10555871736.

The previous prime is 21111743441. The next prime is 21111743491. The reversal of 21111743474 is 47434711112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19495140625 + 1616602849 = 139625^2 + 40207^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277935867 + ... + 5277935870.

Almost surely, 2^21111743474 is an apocalyptic number.

21111743474 is a deficient number, since it is larger than the sum of its proper divisors (10555871740).

21111743474 is a wasteful number, since it uses less digits than its factorization.

21111743474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555871739.

The product of its digits is 18816, while the sum is 35.

The spelling of 21111743474 in words is "twenty-one billion, one hundred eleven million, seven hundred forty-three thousand, four hundred seventy-four".