101221031100 has 144 divisors (see below), whose sum is σ = 354392817408. Its totient is φ = 21775272960.

The previous prime is 101221031029. The next prime is 101221031101. The reversal of 101221031100 is 1130122101.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221031101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1381962 + ... + 1453361.

It is an arithmetic number, because the mean of its divisors is an integer number (2461061232).

Almost surely, 2^101221031100 is an apocalyptic number.

101221031100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221031100 is an abundant number, since it is smaller than the sum of its proper divisors (253171786308).

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

101221031100 is a wasteful number, since it uses less digits than its factorization.

101221031100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835364 (or 2835357 counting only the distinct ones).

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

Adding to 101221031100 its reverse (1130122101), we get a palindrome (102351153201).

The spelling of 101221031100 in words is "one hundred one billion, two hundred twenty-one million, thirty-one thousand, one hundred".