21214036533601 has 8 divisors (see below), whose sum is σ = 21318424965864. Its totient is φ = 21109762128000.

The previous prime is 21214036533593. The next prime is 21214036533623. The reversal of 21214036533601 is 10633563041212.

It can be written as a sum of positive squares in 4 ways, for example, as 1393946229025 + 19820090304576 = 1180655^2 + 4451976^2 .

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 21214036533601 - 2³ = 21214036533593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214036533671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28133650 + ... + 28877851.

It is an arithmetic number, because the mean of its divisors is an integer number (2664803120733).

Almost surely, 2^{21214036533601} is an apocalyptic number.

It is an amenable number.

21214036533601 is a deficient number, since it is larger than the sum of its proper divisors (104388432263).

21214036533601 is a wasteful number, since it uses less digits than its factorization.

21214036533601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57013331.

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 21214036533601 its reverse (10633563041212), we get a palindrome (31847599574813).

The spelling of 21214036533601 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-three thousand, six hundred one".