21366534732001 has 16 divisors (see below), whose sum is σ = 23217325834240. Its totient is φ = 19588407662160.

The previous prime is 21366534731999. The next prime is 21366534732181. The reversal of 21366534732001 is 10023743566312.

It is a cyclic number.

It is not a de Polignac number, because 21366534732001 - 2¹ = 21366534731999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21366534832001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19095046 + ... + 20183008.

It is an arithmetic number, because the mean of its divisors is an integer number (1451082864640).

Almost surely, 2^{21366534732001} is an apocalyptic number.

It is an amenable number.

21366534732001 is a deficient number, since it is larger than the sum of its proper divisors (1850791102239).

21366534732001 is a wasteful number, since it uses less digits than its factorization.

21366534732001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121356.

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 21366534732001 in words is "twenty-one trillion, three hundred sixty-six billion, five hundred thirty-four million, seven hundred thirty-two thousand, one".