121211112201021 has 24 divisors (see below), whose sum is σ = 179915195130840. Its totient is φ = 78579475491456.

The previous prime is 121211112200987. The next prime is 121211112201059. The reversal of 121211112201021 is 120102211112121.

It is a happy number.

121211112201021 is a `hidden beast` number, since 121 + 211 + 11 + 220 + 102 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 86292302103225 + 34918810097796 = 9289365^2 + 5909214^2 .

It is not a de Polignac number, because 121211112201021 - 2⁹ = 121211112200509 is a prime.

It is a super-2 number, since 2×121211112201021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121211112200985 and 121211112201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211112201061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101136330 + ... + 102327803.

It is an arithmetic number, because the mean of its divisors is an integer number (7496466463785).

Almost surely, 2^{121211112201021} is an apocalyptic number.

It is an amenable number.

121211112201021 is a deficient number, since it is larger than the sum of its proper divisors (58704082929819).

121211112201021 is a wasteful number, since it uses less digits than its factorization.

121211112201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203465965 (or 203465962 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121211112201021 its reverse (120102211112121), we get a palindrome (241313323313142).

The spelling of 121211112201021 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred one thousand, twenty-one".