121321103220 has 72 divisors (see below), whose sum is σ = 368092637640. Its totient is φ = 32344796160.

The previous prime is 121321103203. The next prime is 121321103221. The reversal of 121321103220 is 22301123121.

121321103220 is a `hidden beast` number, since 1 + 21 + 321 + 1 + 0 + 322 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 34994436624 + 86326666596 = 187068^2 + 293814^2 .

It is a super-3 number, since 3×121321103220³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121321103193 and 121321103202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321103221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 723496 + ... + 875264.

It is an arithmetic number, because the mean of its divisors is an integer number (5112397745).

Almost surely, 2^121321103220 is an apocalyptic number.

121321103220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121321103220 is an abundant number, since it is smaller than the sum of its proper divisors (246771534420).

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

121321103220 is a wasteful number, since it uses less digits than its factorization.

121321103220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156225 (or 156220 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 121321103220 its reverse (22301123121), we get a palindrome (143622226341).

The spelling of 121321103220 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred three thousand, two hundred twenty".