121202100022021 has 4 divisors (see below), whose sum is σ = 128331635317452. Its totient is φ = 114072564726592.

The previous prime is 121202100022009. The next prime is 121202100022037. The reversal of 121202100022021 is 120220001202121.

It is a happy number.

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 87640771572225 + 33561328449796 = 9361665^2 + 5793214^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202100022021 - 2¹⁵ = 121202099989253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121202100021986 and 121202100022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202100022001) 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, 3564767647690 + ... + 3564767647723.

It is an arithmetic number, because the mean of its divisors is an integer number (32082908829363).

Almost surely, 2^{121202100022021} is an apocalyptic number.

It is an amenable number.

121202100022021 is a deficient number, since it is larger than the sum of its proper divisors (7129535295431).

121202100022021 is an equidigital number, since it uses as much as digits as its factorization.

121202100022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129535295430.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121202100022021 its reverse (120220001202121), we get a palindrome (241422101224142).

The spelling of 121202100022021 in words is "one hundred twenty-one trillion, two hundred two billion, one hundred million, twenty-two thousand, twenty-one".