121221223020 has 72 divisors (see below), whose sum is σ = 368706496704. Its totient is φ = 32237561088.

The previous prime is 121221222989. The next prime is 121221223061. The reversal of 121221223020 is 20322122121.

121221223020 is a `hidden beast` number, since 121 + 221 + 22 + 302 + 0 = 666.

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 = 121221222984 and 121221223002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 851449 + ... + 983568.

Almost surely, 2^121221223020 is an apocalyptic number.

121221223020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221223020 is an abundant number, since it is smaller than the sum of its proper divisors (247485273684).

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

121221223020 is a wasteful number, since it uses less digits than its factorization.

121221223020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835399 (or 1835394 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 121221223020 its reverse (20322122121), we get a palindrome (141543345141).

The spelling of 121221223020 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-three thousand, twenty".