121311212212021 has 8 divisors (see below), whose sum is σ = 130801970416824. Its totient is φ = 111843186363840.

The previous prime is 121311212211997. The next prime is 121311212212067. The reversal of 121311212212021 is 120212212113121.

It can be written as a sum of positive squares in 4 ways, for example, as 7194658185796 + 114116554026225 = 2682286^2 + 10682535^2 .

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 121311212212021 - 2³¹ = 121309064728373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121311212211983 and 121311212212001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311212215021) 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, 5683078066 + ... + 5683099411.

It is an arithmetic number, because the mean of its divisors is an integer number (16350246302103).

Almost surely, 2^{121311212212021} is an apocalyptic number.

It is an amenable number.

121311212212021 is a deficient number, since it is larger than the sum of its proper divisors (9490758204803).

121311212212021 is a wasteful number, since it uses less digits than its factorization.

121311212212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11366178311.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 121311212212021 its reverse (120212212113121), we get a palindrome (241523424325142).

The spelling of 121311212212021 in words is "one hundred twenty-one trillion, three hundred eleven billion, two hundred twelve million, two hundred twelve thousand, twenty-one".