121212212021 has 8 divisors (see below), whose sum is σ = 125428849920. Its totient is φ = 116998034608.

The previous prime is 121212212003. The next prime is 121212212027. The reversal of 121212212021 is 120212212121.

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 121212212021 - 2¹⁸ = 121211949877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212212027) 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, 514601 + ... + 712206.

It is an arithmetic number, because the mean of its divisors is an integer number (15678606240).

Almost surely, 2^121212212021 is an apocalyptic number.

It is an amenable number.

121212212021 is a deficient number, since it is larger than the sum of its proper divisors (4216637899).

121212212021 is a wasteful number, since it uses less digits than its factorization.

121212212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230243.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121212212021 its reverse (120212212121), we get a palindrome (241424424142).

The spelling of 121212212021 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, twenty-one".