21121164613423 has 8 divisors (see below), whose sum is σ = 24312131930240. Its totient is φ = 17973611818200.

The previous prime is 21121164613309. The next prime is 21121164613457. The reversal of 21121164613423 is 32431646112112.

It is a happy number.

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 21121164613423 - 2¹³ = 21121164605231 is a prime.

It is a super-2 number, since 2×21121164613423² (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 (21121164613123) 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, 10853629353 + ... + 10853631298.

It is an arithmetic number, because the mean of its divisors is an integer number (3039016491280).

Almost surely, 2^{21121164613423} is an apocalyptic number.

21121164613423 is a deficient number, since it is larger than the sum of its proper divisors (3190967316817).

21121164613423 is a wasteful number, since it uses less digits than its factorization.

21121164613423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21707260797.

The product of its digits is 41472, while the sum is 37.

The spelling of 21121164613423 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred sixty-four million, six hundred thirteen thousand, four hundred twenty-three".