21346543733824 has 21 divisors (see below), whose sum is σ = 42359621068117. Its totient is φ = 10673253385984.

The previous prime is 21346543733813. The next prime is 21346543733831. The reversal of 21346543733824 is 42833734564312.

The square root of 21346543733824 is 4620232.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 17150928911424 + 4195614822400 = 4141368^2 + 2048320^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 36673092 + ... + 37250620.

Almost surely, 2^{21346543733824} is an apocalyptic number.

21346543733824 is the 4620232-nd square number.

It is an amenable number.

21346543733824 is a deficient number, since it is larger than the sum of its proper divisors (21013077334293).

21346543733824 is an frugal number, since it uses more digits than its factorization.

21346543733824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155070 (or 577531 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 55.

The spelling of 21346543733824 in words is "twenty-one trillion, three hundred forty-six billion, five hundred forty-three million, seven hundred thirty-three thousand, eight hundred twenty-four".