121212020021 has 8 divisors (see below), whose sum is σ = 126597432384. Its totient is φ = 115836218080.

The previous prime is 121212020011. The next prime is 121212020023. The reversal of 121212020021 is 120020212121.

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-121212020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212019978 and 121212020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212020023) 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, 2376815 + ... + 2427276.

It is an arithmetic number, because the mean of its divisors is an integer number (15824679048).

Almost surely, 2^121212020021 is an apocalyptic number.

It is an amenable number.

121212020021 is a deficient number, since it is larger than the sum of its proper divisors (5385412363).

121212020021 is a wasteful number, since it uses less digits than its factorization.

121212020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805211.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121212020021 its reverse (120020212121), we get a palindrome (241232232142).

The spelling of 121212020021 in words is "one hundred twenty-one billion, two hundred twelve million, twenty thousand, twenty-one".