2231220121020 has 120 divisors (see below), whose sum is σ = 7635731141808. Its totient is φ = 540901843200.

The previous prime is 2231220121019. The next prime is 2231220121057. The reversal of 2231220121020 is 201210221322.

2231220121020 is a `hidden beast` number, since 2 + 231 + 2 + 201 + 210 + 20 = 666.

It is a super-3 number, since 3×2231220121020³ (a number of 38 digits) contains 333 as substring.

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 = 2231220120984 and 2231220121002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 62586561 + ... + 62622200.

Almost surely, 2^{2231220121020} is an apocalyptic number.

2231220121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2231220121020 is an abundant number, since it is smaller than the sum of its proper divisors (5404511020788).

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

2231220121020 is a wasteful number, since it uses less digits than its factorization.

2231220121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125208793 (or 125208782 counting only the distinct ones).

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

Adding to 2231220121020 its reverse (201210221322), we get a palindrome (2432430342342).

The spelling of 2231220121020 in words is "two trillion, two hundred thirty-one billion, two hundred twenty million, one hundred twenty-one thousand, twenty".