101212121020 has 24 divisors (see below), whose sum is σ = 213971940000. Its totient is φ = 40213136832.

The previous prime is 101212120991. The next prime is 101212121029. The reversal of 101212121020 is 20121212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212121029) 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, 16978920 + ... + 16984879.

It is an arithmetic number, because the mean of its divisors is an integer number (8915497500).

Almost surely, 2^101212121020 is an apocalyptic number.

101212121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101212121020 is an abundant number, since it is smaller than the sum of its proper divisors (112759818980).

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

101212121020 is a wasteful number, since it uses less digits than its factorization.

101212121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33963957 (or 33963955 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101212121020 its reverse (20121212101), we get a palindrome (121333333121).

The spelling of 101212121020 in words is "one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, twenty".