2121213031020 has 36 divisors (see below), whose sum is σ = 6434346194640. Its totient is φ = 565656808224.

The previous prime is 2121213030971. The next prime is 2121213031027. The reversal of 2121213031020 is 201303121212.

2121213031020 is a `hidden beast` number, since 2 + 121 + 213 + 0 + 310 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 2121213030984 and 2121213031002.

It is not an unprimeable number, because it can be changed into a prime (2121213031027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5892258240 + ... + 5892258599.

It is an arithmetic number, because the mean of its divisors is an integer number (178731838740).

Almost surely, 2^{2121213031020} is an apocalyptic number.

2121213031020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121213031020 is an abundant number, since it is smaller than the sum of its proper divisors (4313133163620).

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

2121213031020 is a wasteful number, since it uses less digits than its factorization.

2121213031020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11784516854 (or 11784516849 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2121213031020 its reverse (201303121212), we get a palindrome (2322516152232).

The spelling of 2121213031020 in words is "two trillion, one hundred twenty-one billion, two hundred thirteen million, thirty-one thousand, twenty".