10121220020 has 24 divisors (see below), whose sum is σ = 21283589544. Its totient is φ = 4042958976.

The previous prime is 10121220017. The next prime is 10121220059. The reversal of 10121220020 is 2002212101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 663268516 + 9457951504 = 25754^2 + 97252^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10121219983 and 10121220010.

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, 330539 + ... + 359858.

It is an arithmetic number, because the mean of its divisors is an integer number (886816231).

Almost surely, 2^10121220020 is an apocalyptic number.

10121220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10121220020 is an abundant number, since it is smaller than the sum of its proper divisors (11162369524).

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

10121220020 is a wasteful number, since it uses less digits than its factorization.

10121220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691139 (or 691137 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10121220020 its reverse (2002212101), we get a palindrome (12123432121).

The spelling of 10121220020 in words is "ten billion, one hundred twenty-one million, two hundred twenty thousand, twenty".