121322120320021 has 4 divisors (see below), whose sum is σ = 123311007538444. Its totient is φ = 119333233101600.

The previous prime is 121322120320019. The next prime is 121322120320033. The reversal of 121322120320021 is 120023021223121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68414172093796 + 52907948226225 = 8271286^2 + 7273785^2 .

It is a cyclic number.

It is not a de Polignac number, because 121322120320021 - 2¹ = 121322120320019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121322120319974 and 121322120320001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121322120320421) 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, 994443609120 + ... + 994443609241.

It is an arithmetic number, because the mean of its divisors is an integer number (30827751884611).

Almost surely, 2^{121322120320021} is an apocalyptic number.

It is an amenable number.

121322120320021 is a deficient number, since it is larger than the sum of its proper divisors (1988887218423).

121322120320021 is an equidigital number, since it uses as much as digits as its factorization.

121322120320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988887218422.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 121322120320021 its reverse (120023021223121), we get a palindrome (241345141543142).

The spelling of 121322120320021 in words is "one hundred twenty-one trillion, three hundred twenty-two billion, one hundred twenty million, three hundred twenty thousand, twenty-one".