21213601561361 has 16 divisors (see below), whose sum is σ = 23382588022080. Its totient is φ = 19084726932480.

The previous prime is 21213601561337. The next prime is 21213601561367. The reversal of 21213601561361 is 16316510631212.

It is not a de Polignac number, because 21213601561361 - 2⁶ = 21213601561297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213601561367) 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, 12439310 + ... + 14041496.

It is an arithmetic number, because the mean of its divisors is an integer number (1461411751380).

Almost surely, 2^{21213601561361} is an apocalyptic number.

It is an amenable number.

21213601561361 is a deficient number, since it is larger than the sum of its proper divisors (2168986460719).

21213601561361 is a wasteful number, since it uses less digits than its factorization.

21213601561361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614704.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 21213601561361 in words is "twenty-one trillion, two hundred thirteen billion, six hundred one million, five hundred sixty-one thousand, three hundred sixty-one".