21121141616643 has 8 divisors (see below), whose sum is σ = 28164299192656. Its totient is φ = 14079372559200.

The previous prime is 21121141616593. The next prime is 21121141616647. The reversal of 21121141616643 is 34661614112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121141616643 - 2¹² = 21121141612547 is a prime.

It is a super-2 number, since 2×21121141616643² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121141616647) 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, 347094148 + ... + 347154993.

It is an arithmetic number, because the mean of its divisors is an integer number (3520537399082).

Almost surely, 2^{21121141616643} is an apocalyptic number.

21121141616643 is a deficient number, since it is larger than the sum of its proper divisors (7043157576013).

21121141616643 is a wasteful number, since it uses less digits than its factorization.

21121141616643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694259285.

The product of its digits is 41472, while the sum is 39.

Adding to 21121141616643 its reverse (34661614112112), we get a palindrome (55782755728755).

The spelling of 21121141616643 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred forty-one million, six hundred sixteen thousand, six hundred forty-three".