121220212011021 has 96 divisors (see below), whose sum is σ = 181633949392896. Its totient is φ = 77860085760000.

The previous prime is 121220212011013. The next prime is 121220212011149. The reversal of 121220212011021 is 120110212022121.

121220212011021 is a `hidden beast` number, since 1 + 212 + 202 + 120 + 110 + 21 = 666.

It is not a de Polignac number, because 121220212011021 - 2³ = 121220212011013 is a prime.

It is a super-3 number, since 3×121220212011021³ (a number of 43 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121220212010985 and 121220212011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220212011221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6599882580 + ... + 6599900946.

It is an arithmetic number, because the mean of its divisors is an integer number (1892020306176).

Almost surely, 2^{121220212011021} is an apocalyptic number.

It is an amenable number.

121220212011021 is a deficient number, since it is larger than the sum of its proper divisors (60413737381875).

121220212011021 is a wasteful number, since it uses less digits than its factorization.

121220212011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19403 (or 19400 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121220212011021 its reverse (120110212022121), we get a palindrome (241330424033142).

The spelling of 121220212011021 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twelve million, eleven thousand, twenty-one".