121202111021 has 2 divisors, whose sum is σ = 121202111022. Its totient is φ = 121202111020.

The previous prime is 121202111011. The next prime is 121202111053. The reversal of 121202111021 is 120111202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120957188521 + 244922500 = 347789^2 + 15650^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202111021 - 2⁶ = 121202110957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121202110987 and 121202111005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121202111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60601055510 + 60601055511.

It is an arithmetic number, because the mean of its divisors is an integer number (60601055511).

Almost surely, 2^121202111021 is an apocalyptic number.

It is an amenable number.

121202111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121202111021 is an equidigital number, since it uses as much as digits as its factorization.

121202111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121202111021 its reverse (120111202121), we get a palindrome (241313313142).

The spelling of 121202111021 in words is "one hundred twenty-one billion, two hundred two million, one hundred eleven thousand, twenty-one".