121202002021 has 4 divisors (see below), whose sum is σ = 122909072544. Its totient is φ = 119494931500.

The previous prime is 121202001989. The next prime is 121202002067. The reversal of 121202002021 is 120200202121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120200202121 = 307 ⋅391531603.

It is a cyclic number.

It is not a de Polignac number, because 121202002021 - 2⁵ = 121202001989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121202001992 and 121202002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202002081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853535155 + ... + 853535296.

It is an arithmetic number, because the mean of its divisors is an integer number (30727268136).

Almost surely, 2^121202002021 is an apocalyptic number.

It is an amenable number.

121202002021 is a deficient number, since it is larger than the sum of its proper divisors (1707070523).

121202002021 is an equidigital number, since it uses as much as digits as its factorization.

121202002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707070522.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121202002021 its reverse (120200202121), we get a palindrome (241402204142).

The spelling of 121202002021 in words is "one hundred twenty-one billion, two hundred two million, two thousand, twenty-one".