10121123220 has 96 divisors (see below), whose sum is σ = 30674464128. Its totient is φ = 2478669312.

The previous prime is 10121123203. The next prime is 10121123231. The reversal of 10121123220 is 2232112101.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 10121123220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120727 + ... + 186593.

It is an arithmetic number, because the mean of its divisors is an integer number (319525668).

Almost surely, 2^10121123220 is an apocalyptic number.

10121123220 is a gapful number since it is divisible by the number (10) 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 10121123220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15337232064).

10121123220 is an abundant number, since it is smaller than the sum of its proper divisors (20553340908).

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

10121123220 is a wasteful number, since it uses less digits than its factorization.

10121123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66089 (or 66087 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 10121123220 its reverse (2232112101), we get a palindrome (12353235321).

The spelling of 10121123220 in words is "ten billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty".