2121223021020 has 72 divisors (see below), whose sum is σ = 6435755975376. Its totient is φ = 565538199552.

The previous prime is 2121223020989. The next prime is 2121223021031. The reversal of 2121223021020 is 201203221212.

2121223021020 is a `hidden beast` number, since 212 + 1 + 223 + 0 + 210 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2121223020984 and 2121223021002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419782 + ... + 2102061.

It is an arithmetic number, because the mean of its divisors is an integer number (89385499658).

Almost surely, 2^{2121223021020} is an apocalyptic number.

2121223021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121223021020 is an abundant number, since it is smaller than the sum of its proper divisors (4314532954356).

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

2121223021020 is a wasteful number, since it uses less digits than its factorization.

2121223021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526531 (or 2526526 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 2121223021020 its reverse (201203221212), we get a palindrome (2322426242232).

The spelling of 2121223021020 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-three million, twenty-one thousand, twenty".