12121202021 has 8 divisors (see below), whose sum is σ = 12306308160. Its totient is φ = 11936219328.

The previous prime is 12121201997. The next prime is 12121202039. The reversal of 12121202021 is 12020212121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121202021 - 2⁶ = 12121201957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121201987 and 12121202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121402021) 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, 177680 + ... + 236246.

It is an arithmetic number, because the mean of its divisors is an integer number (1538288520).

Almost surely, 2^12121202021 is an apocalyptic number.

It is an amenable number.

12121202021 is a deficient number, since it is larger than the sum of its proper divisors (185106139).

12121202021 is an equidigital number, since it uses as much as digits as its factorization.

12121202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61723.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12121202021 its reverse (12020212121), we get a palindrome (24141414142).

The spelling of 12121202021 in words is "twelve billion, one hundred twenty-one million, two hundred two thousand, twenty-one".