101221202020 has 24 divisors (see below), whose sum is σ = 212571286200. Its totient is φ = 40487192832.

The previous prime is 101221201943. The next prime is 101221202023. The reversal of 101221202020 is 20202122101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28204515364 + 73016686656 = 167942^2 + 270216^2 .

It is not an unprimeable number, because it can be changed into a prime (101221202023) 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, 797496 + ... + 915664.

It is an arithmetic number, because the mean of its divisors is an integer number (8857136925).

Almost surely, 2^101221202020 is an apocalyptic number.

101221202020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221202020 is an abundant number, since it is smaller than the sum of its proper divisors (111350084180).

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

101221202020 is a wasteful number, since it uses less digits than its factorization.

101221202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161007 (or 161005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 101221202020 its reverse (20202122101), we get a palindrome (121423324121).

The spelling of 101221202020 in words is "one hundred one billion, two hundred twenty-one million, two hundred two thousand, twenty".