2123132220 has 144 divisors (see below), whose sum is σ = 7039992960. Its totient is φ = 513648000.

The previous prime is 2123132201. The next prime is 2123132239. The reversal of 2123132220 is 222313212.

It is an interprime number because it is at equal distance from previous prime (2123132201) and next prime (2123132239).

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 = 2123132193 and 2123132202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1462495 + ... + 1463945.

It is an arithmetic number, because the mean of its divisors is an integer number (48888840).

Almost surely, 2^2123132220 is an apocalyptic number.

2123132220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2123132220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3519996480).

2123132220 is an abundant number, since it is smaller than the sum of its proper divisors (4916860740).

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

2123132220 is a wasteful number, since it uses less digits than its factorization.

2123132220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216 (or 2211 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2123132220 is about 46077.4589143108. The cubic root of 2123132220 is about 1285.2640113210.

Adding to 2123132220 its reverse (222313212), we get a palindrome (2345445432).

The spelling of 2123132220 in words is "two billion, one hundred twenty-three million, one hundred thirty-two thousand, two hundred twenty".