121012212111221 has 8 divisors (see below), whose sum is σ = 121027830144984. Its totient is φ = 120996595114240.

The previous prime is 121012212111199. The next prime is 121012212111269. The reversal of 121012212111221 is 122111212210121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 66699660324196 + 54312551787025 = 8166986^2 + 7369705^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121012212111221 is a prime.

It is a super-2 number, since 2×121012212111221² (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 = 121012212111193 and 121012212111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012212114221) 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, 248332991 + ... + 248819811.

It is an arithmetic number, because the mean of its divisors is an integer number (15128478768123).

Almost surely, 2^{121012212111221} is an apocalyptic number.

It is an amenable number.

121012212111221 is a deficient number, since it is larger than the sum of its proper divisors (15618033763).

121012212111221 is a wasteful number, since it uses less digits than its factorization.

121012212111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518391.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121012212111221 its reverse (122111212210121), we get a palindrome (243123424321342).

The spelling of 121012212111221 in words is "one hundred twenty-one trillion, twelve billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-one".