121210110001021 has 8 divisors (see below), whose sum is σ = 122283077754744. Its totient is φ = 120137147719680.

The previous prime is 121210110000961. The next prime is 121210110001031. The reversal of 121210110001021 is 120100011012121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8295811260025 + 112914298740996 = 2880245^2 + 10626114^2 .

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 121210110001021 - 2⁷ = 121210110000893 is a prime.

It is a super-2 number, since 2×121210110001021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210110000992 and 121210110001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210110001031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52458315 + ... + 54720151.

It is an arithmetic number, because the mean of its divisors is an integer number (15285384719343).

Almost surely, 2^{121210110001021} is an apocalyptic number.

It is an amenable number.

121210110001021 is a deficient number, since it is larger than the sum of its proper divisors (1072967753723).

121210110001021 is a wasteful number, since it uses less digits than its factorization.

121210110001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736191.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121210110001021 its reverse (120100011012121), we get a palindrome (241310121013142).

The spelling of 121210110001021 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred ten million, one thousand, twenty-one".