101221021020 has 96 divisors (see below), whose sum is σ = 323952265728. Its totient is φ = 23133019392.

The previous prime is 101221021001. The next prime is 101221021043. The reversal of 101221021020 is 20120122101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 101221020987 and 101221021005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4388839 + ... + 4411841.

It is an arithmetic number, because the mean of its divisors is an integer number (3374502768).

Almost surely, 2^101221021020 is an apocalyptic number.

101221021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221021020 is an abundant number, since it is smaller than the sum of its proper divisors (222731244708).

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

101221021020 is a wasteful number, since it uses less digits than its factorization.

101221021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33499 (or 33497 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101221021020 its reverse (20120122101), we get a palindrome (121341143121).

The spelling of 101221021020 in words is "one hundred one billion, two hundred twenty-one million, twenty-one thousand, twenty".