101221203020 has 48 divisors (see below), whose sum is σ = 244020338688. Its totient is φ = 34548776640.

The previous prime is 101221203011. The next prime is 101221203137. The reversal of 101221203020 is 20302122101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 101221202986 and 101221203004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1589876 + ... + 1652315.

It is an arithmetic number, because the mean of its divisors is an integer number (5083757056).

Almost surely, 2^101221203020 is an apocalyptic number.

101221203020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221203020 is an abundant number, since it is smaller than the sum of its proper divisors (142799135668).

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

101221203020 is a wasteful number, since it uses less digits than its factorization.

101221203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242430 (or 3242428 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 101221203020 its reverse (20302122101), we get a palindrome (121523325121).

The spelling of 101221203020 in words is "one hundred one billion, two hundred twenty-one million, two hundred three thousand, twenty".