2102021121220 has 24 divisors (see below), whose sum is σ = 4414271640408. Its totient is φ = 840803251200.

The previous prime is 2102021121217. The next prime is 2102021121247. The reversal of 2102021121220 is 221211202012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64487555136 + 2037533566084 = 253944^2 + 1427422^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2102021121194 and 2102021121203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5917030 + ... + 6262210.

It is an arithmetic number, because the mean of its divisors is an integer number (183927985017).

Almost surely, 2^{2102021121220} is an apocalyptic number.

2102021121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102021121220 is an abundant number, since it is smaller than the sum of its proper divisors (2312250519188).

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

2102021121220 is a wasteful number, since it uses less digits than its factorization.

2102021121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649671 (or 649669 counting only the distinct ones).

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

Adding to 2102021121220 its reverse (221211202012), we get a palindrome (2323232323232).

The spelling of 2102021121220 in words is "two trillion, one hundred two billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty".