121023212220 has 72 divisors (see below), whose sum is σ = 369225825696. Its totient is φ = 32086300032.

The previous prime is 121023212209. The next prime is 121023212221. The reversal of 121023212220 is 22212320121.

121023212220 is a `hidden beast` number, since 1 + 210 + 23 + 212 + 220 = 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 = 121023212193 and 121023212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121023212221) 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, 1912072 + ... + 1974351.

It is an arithmetic number, because the mean of its divisors is an integer number (5128136468).

Almost surely, 2^121023212220 is an apocalyptic number.

121023212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121023212220 is an abundant number, since it is smaller than the sum of its proper divisors (248202613476).

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

121023212220 is a wasteful number, since it uses less digits than its factorization.

121023212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886611 (or 3886606 counting only the distinct ones).

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

Adding to 121023212220 its reverse (22212320121), we get a palindrome (143235532341).

The spelling of 121023212220 in words is "one hundred twenty-one billion, twenty-three million, two hundred twelve thousand, two hundred twenty".