20101210120 has 32 divisors (see below), whose sum is σ = 45248359320. Its totient is φ = 8036815360.

The previous prime is 20101210099. The next prime is 20101210121. The reversal of 20101210120 is 2101210102.

It can be written as a sum of positive squares in 4 ways, for example, as 18397667044 + 1703543076 = 135638^2 + 41274^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20101210097 and 20101210106.

It is not an unprimeable number, because it can be changed into a prime (20101210121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25021 + ... + 202060.

Almost surely, 2^20101210120 is an apocalyptic number.

20101210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101210120 is an abundant number, since it is smaller than the sum of its proper divisors (25147149200).

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

20101210120 is a wasteful number, since it uses less digits than its factorization.

20101210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229305 (or 229301 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20101210120 its reverse (2101210102), we get a palindrome (22202420222).

The spelling of 20101210120 in words is "twenty billion, one hundred one million, two hundred ten thousand, one hundred twenty".