2121231020 has 12 divisors (see below), whose sum is σ = 4454585184. Its totient is φ = 848492400.

The previous prime is 2121231011. The next prime is 2121231029. The reversal of 2121231020 is 201321212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121231011) and next prime (2121231029).

It is a junction number, because it is equal to n+sod(n) for n = 2121230986 and 2121231004.

It is not an unprimeable number, because it can be changed into a prime (2121231029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53030756 + ... + 53030795.

It is an arithmetic number, because the mean of its divisors is an integer number (371215432).

Almost surely, 2^2121231020 is an apocalyptic number.

2121231020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121231020 is an abundant number, since it is smaller than the sum of its proper divisors (2333354164).

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

2121231020 is a wasteful number, since it uses less digits than its factorization.

2121231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106061560 (or 106061558 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2121231020 is about 46056.8238158039. The cubic root of 2121231020 is about 1284.8802585411.

Adding to 2121231020 its reverse (201321212), we get a palindrome (2322552232).

The spelling of 2121231020 in words is "two billion, one hundred twenty-one million, two hundred thirty-one thousand, twenty".