121100012021 has 2 divisors, whose sum is σ = 121100012022. Its totient is φ = 121100012020.

The previous prime is 121100012009. The next prime is 121100012069. The reversal of 121100012021 is 120210001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67813368100 + 53286643921 = 260410^2 + 230839^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100012021 - 2⁶ = 121100011957 is a prime.

It is a super-2 number, since 2×121100012021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121100011993 and 121100012011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121100012821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550006010 + 60550006011.

It is an arithmetic number, because the mean of its divisors is an integer number (60550006011).

Almost surely, 2^121100012021 is an apocalyptic number.

It is an amenable number.

121100012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100012021 is an equidigital number, since it uses as much as digits as its factorization.

121100012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121100012021 its reverse (120210001121), we get a palindrome (241310013142).

The spelling of 121100012021 in words is "one hundred twenty-one billion, one hundred million, twelve thousand, twenty-one".