121321110000021 has 4 divisors (see below), whose sum is σ = 161761480000032. Its totient is φ = 80880740000012.

The previous prime is 121321110000017. The next prime is 121321110000023. The reversal of 121321110000021 is 120000011123121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121321110000021 - 2² = 121321110000017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321110000023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20220185000001 + ... + 20220185000006.

It is an arithmetic number, because the mean of its divisors is an integer number (40440370000008).

Almost surely, 2^{121321110000021} is an apocalyptic number.

It is an amenable number.

121321110000021 is a deficient number, since it is larger than the sum of its proper divisors (40440370000011).

121321110000021 is an equidigital number, since it uses as much as digits as its factorization.

121321110000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40440370000010.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 121321110000021 its reverse (120000011123121), we get a palindrome (241321121123142).

The spelling of 121321110000021 in words is "one hundred twenty-one trillion, three hundred twenty-one billion, one hundred ten million, twenty-one", and thus it is an aban number.