21121000323 has 8 divisors (see below), whose sum is σ = 28169207808. Its totient is φ = 14076729864.

The previous prime is 21121000297. The next prime is 21121000331. The reversal of 21121000323 is 32300012112.

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

It is not a de Polignac number, because 21121000323 - 2²⁵ = 21087445891 is a prime.

It is a super-2 number, since 2×21121000323² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121070323) 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, 971715 + ... + 993212.

It is an arithmetic number, because the mean of its divisors is an integer number (3521150976).

Almost surely, 2^21121000323 is an apocalyptic number.

21121000323 is a deficient number, since it is larger than the sum of its proper divisors (7048207485).

21121000323 is a wasteful number, since it uses less digits than its factorization.

21121000323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968513.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21121000323 its reverse (32300012112), we get a palindrome (53421012435).

The spelling of 21121000323 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-three", and thus it is an aban number.