21121210021323 has 8 divisors (see below), whose sum is σ = 28162071438336. Its totient is φ = 14080577642600.

The previous prime is 21121210021321. The next prime is 21121210021343. The reversal of 21121210021323 is 32312001212112.

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 21121210021323 - 2¹ = 21121210021321 is a prime.

It is a super-2 number, since 2×21121210021323² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121210021323.

It is not an unprimeable number, because it can be changed into a prime (21121210021321) 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, 57044283 + ... + 57413348.

It is an arithmetic number, because the mean of its divisors is an integer number (3520258929792).

Almost surely, 2^{21121210021323} is an apocalyptic number.

21121210021323 is a deficient number, since it is larger than the sum of its proper divisors (7040861417013).

21121210021323 is a wasteful number, since it uses less digits than its factorization.

21121210021323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114519145.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21121210021323 its reverse (32312001212112), we get a palindrome (53433211233435).

The spelling of 21121210021323 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, twenty-one thousand, three hundred twenty-three".