2121210021220 has 48 divisors (see below), whose sum is σ = 4460170780800. Its totient is φ = 847412034560.

The previous prime is 2121210021199. The next prime is 2121210021233. The reversal of 2121210021220 is 221200121212.

It is a happy number.

It is a super-3 number, since 3×2121210021220³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121210021194 and 2121210021203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197518611 + ... + 197529349.

It is an arithmetic number, because the mean of its divisors is an integer number (92920224600).

Almost surely, 2^{2121210021220} is an apocalyptic number.

2121210021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121210021220 is an abundant number, since it is smaller than the sum of its proper divisors (2338960759580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121210021220 is a wasteful number, since it uses less digits than its factorization.

2121210021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22308 (or 22306 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2121210021220 its reverse (221200121212), we get a palindrome (2342410142432).

The spelling of 2121210021220 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, twenty-one thousand, two hundred twenty".