101200021000 has 64 divisors (see below), whose sum is σ = 255024085680. Its totient is φ = 37366156800.

The previous prime is 101200020979. The next prime is 101200021003. The reversal of 101200021000 is 120002101.

It can be written as a sum of positive squares in 8 ways, for example, as 275626404 + 100924394596 = 16602^2 + 317686^2 .

It is not an unprimeable number, because it can be changed into a prime (101200021003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3879309 + ... + 3905308.

Almost surely, 2^101200021000 is an apocalyptic number.

101200021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101200021000 is an abundant number, since it is smaller than the sum of its proper divisors (153824064680).

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

101200021000 is a wasteful number, since it uses less digits than its factorization.

101200021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7784651 (or 7784637 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 101200021000 its reverse (120002101), we get a palindrome (101320023101).

The spelling of 101200021000 in words is "one hundred one billion, two hundred million, twenty-one thousand".