101221200020 has 48 divisors (see below), whose sum is σ = 233480499840. Its totient is φ = 36689786496.

The previous prime is 101221200011. The next prime is 101221200053. The reversal of 101221200020 is 20002122101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 101221199974 and 101221200010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5781947 + ... + 5799426.

It is an arithmetic number, because the mean of its divisors is an integer number (4864177080).

Almost surely, 2^101221200020 is an apocalyptic number.

101221200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221200020 is an abundant number, since it is smaller than the sum of its proper divisors (132259299820).

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

101221200020 is a wasteful number, since it uses less digits than its factorization.

101221200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11581424 (or 11581422 counting only the distinct ones).

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

Adding to 101221200020 its reverse (20002122101), we get a palindrome (121223322121).

The spelling of 101221200020 in words is "one hundred one billion, two hundred twenty-one million, two hundred thousand, twenty".