121220212211021 has 16 divisors (see below), whose sum is σ = 151797471552000. Its totient is φ = 94041196712880.

The previous prime is 121220212210969. The next prime is 121220212211041. The reversal of 121220212211021 is 120112212022121.

It is a cyclic number.

It is not a de Polignac number, because 121220212211021 - 2¹⁴ = 121220212194637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220212210984 and 121220212211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220212211041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3467578271 + ... + 3467613228.

It is an arithmetic number, because the mean of its divisors is an integer number (9487341972000).

Almost surely, 2^{121220212211021} is an apocalyptic number.

121220212211021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220212211021 is a deficient number, since it is larger than the sum of its proper divisors (30577259340979).

121220212211021 is a wasteful number, since it uses less digits than its factorization.

121220212211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6935191744.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121220212211021 its reverse (120112212022121), we get a palindrome (241332424233142).

The spelling of 121220212211021 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred eleven thousand, twenty-one".