21365554734334 has 4 divisors (see below), whose sum is σ = 32048332101504. Its totient is φ = 10682777367166.

The previous prime is 21365554734317. The next prime is 21365554734347. The reversal of 21365554734334 is 43343745556312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341388683582 + ... + 5341388683585.

It is an arithmetic number, because the mean of its divisors is an integer number (8012083025376).

Almost surely, 2^{21365554734334} is an apocalyptic number.

21365554734334 is a deficient number, since it is larger than the sum of its proper divisors (10682777367170).

21365554734334 is a wasteful number, since it uses less digits than its factorization.

21365554734334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10682777367169.

The product of its digits is 54432000, while the sum is 55.

The spelling of 21365554734334 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred fifty-four million, seven hundred thirty-four thousand, three hundred thirty-four".