121211573328 has 60 divisors (see below), whose sum is σ = 339431939028. Its totient is φ = 40379097600.

The previous prime is 121211573321. The next prime is 121211573339. The reversal of 121211573328 is 823375112121.

121211573328 is a `hidden beast` number, since 1 + 212 + 115 + 7 + 3 + 328 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 44145371664 + 77066201664 = 210108^2 + 277608^2 .

It is a super-3 number, since 3×121211573328³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 121211573292 and 121211573301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211573321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21373 + ... + 492828.

Almost surely, 2^121211573328 is an apocalyptic number.

121211573328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121211573328 is an abundant number, since it is smaller than the sum of its proper divisors (218220365700).

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

121211573328 is a wasteful number, since it uses less digits than its factorization.

121211573328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515852 (or 515843 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

Adding to 121211573328 its reverse (823375112121), we get a palindrome (944586685449).

The spelling of 121211573328 in words is "one hundred twenty-one billion, two hundred eleven million, five hundred seventy-three thousand, three hundred twenty-eight".