101218212820 has 24 divisors (see below), whose sum is σ = 215119193184. Its totient is φ = 39999485856.

The previous prime is 101218212793. The next prime is 101218212827. The reversal of 101218212820 is 28212812101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101218212827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30485754 + ... + 30489073.

It is an arithmetic number, because the mean of its divisors is an integer number (8963299716).

Almost surely, 2^101218212820 is an apocalyptic number.

101218212820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101218212820 is an abundant number, since it is smaller than the sum of its proper divisors (113900980364).

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

101218212820 is a wasteful number, since it uses less digits than its factorization.

101218212820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60974919 (or 60974917 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The spelling of 101218212820 in words is "one hundred one billion, two hundred eighteen million, two hundred twelve thousand, eight hundred twenty".