2123103211220 has 24 divisors (see below), whose sum is σ = 4458831917064. Its totient is φ = 849181251456.

The previous prime is 2123103211199. The next prime is 2123103211241. The reversal of 2123103211220 is 221123013212.

It is an interprime number because it is at equal distance from previous prime (2123103211199) and next prime (2123103211241).

It can be written as a sum of positive squares in 4 ways, for example, as 540936714256 + 1582166496964 = 735484^2 + 1257842^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2123103211192 and 2123103211201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3461519 + ... + 4028438.

It is an arithmetic number, because the mean of its divisors is an integer number (185784663211).

Almost surely, 2^{2123103211220} is an apocalyptic number.

2123103211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123103211220 is an abundant number, since it is smaller than the sum of its proper divisors (2335728705844).

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

2123103211220 is a wasteful number, since it uses less digits than its factorization.

2123103211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7504139 (or 7504137 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 2123103211220 its reverse (221123013212), we get a palindrome (2344226224432).

The spelling of 2123103211220 in words is "two trillion, one hundred twenty-three billion, one hundred three million, two hundred eleven thousand, two hundred twenty".