21130123101220 has 288 divisors, whose sum is σ = 52838917963776. Its totient is φ = 6948322698240.

The previous prime is 21130123101193. The next prime is 21130123101293. The reversal of 21130123101220 is 2210132103112.

It is a super-2 number, since 2×21130123101220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34810746157 + ... + 34810746763.

It is an arithmetic number, because the mean of its divisors is an integer number (183468465152).

Almost surely, 2^{21130123101220} is an apocalyptic number.

21130123101220 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 21130123101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26419458981888).

21130123101220 is an abundant number, since it is smaller than the sum of its proper divisors (31708794862556).

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

21130123101220 is a wasteful number, since it uses less digits than its factorization.

21130123101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21130123101220 its reverse (2210132103112), we get a palindrome (23340255204332).

The spelling of 21130123101220 in words is "twenty-one trillion, one hundred thirty billion, one hundred twenty-three million, one hundred one thousand, two hundred twenty".