21220040061436 has 6 divisors (see below), whose sum is σ = 37135070107520. Its totient is φ = 10610020030716.

The previous prime is 21220040061427. The next prime is 21220040061439. The reversal of 21220040061436 is 63416004002212.

It is a junction number, because it is equal to n+sod(n) for n = 21220040061398 and 21220040061407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220040061439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652505007676 + ... + 2652505007683.

Almost surely, 2^{21220040061436} is an apocalyptic number.

It is an amenable number.

21220040061436 is a deficient number, since it is larger than the sum of its proper divisors (15915030046084).

21220040061436 is a wasteful number, since it uses less digits than its factorization.

21220040061436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305010015363 (or 5305010015361 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21220040061436 its reverse (63416004002212), we get a palindrome (84636044063648).

The spelling of 21220040061436 in words is "twenty-one trillion, two hundred twenty billion, forty million, sixty-one thousand, four hundred thirty-six".