21221560036013 has 8 divisors (see below), whose sum is σ = 21845450869368. Its totient is φ = 20600318421504.

The previous prime is 21221560035941. The next prime is 21221560036067. The reversal of 21221560036013 is 31063006512212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3071420987209 + 18150139048804 = 1752547^2 + 4260298^2 .

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 21221560036013 - 2⁸ = 21221560035757 is a prime.

It is a super-2 number, since 2×21221560036013² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221560036093) 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, 662288456 + ... + 662320497.

It is an arithmetic number, because the mean of its divisors is an integer number (2730681358671).

Almost surely, 2^{21221560036013} is an apocalyptic number.

It is an amenable number.

21221560036013 is a deficient number, since it is larger than the sum of its proper divisors (623890833355).

21221560036013 is a wasteful number, since it uses less digits than its factorization.

21221560036013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324609423.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 21221560036013 its reverse (31063006512212), we get a palindrome (52284566548225).

The spelling of 21221560036013 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred sixty million, thirty-six thousand, thirteen".