101221021100 has 54 divisors (see below), whose sum is σ = 220091389812. Its totient is φ = 40407096000.

The previous prime is 101221021091. The next prime is 101221021129. The reversal of 101221021100 is 1120122101.

It is a super-2 number, since 2×101221021100² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 99138590 + ... + 99139610.

It is an arithmetic number, because the mean of its divisors is an integer number (4075766478).

Almost surely, 2^101221021100 is an apocalyptic number.

101221021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221021100 is an abundant number, since it is smaller than the sum of its proper divisors (118870368712).

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

101221021100 is an equidigital number, since it uses as much as digits as its factorization.

101221021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027 (or 1999 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101221021100 its reverse (1120122101), we get a palindrome (102341143201).

The spelling of 101221021100 in words is "one hundred one billion, two hundred twenty-one million, twenty-one thousand, one hundred".