121221021222020 has 24 divisors (see below), whose sum is σ = 254647965617304. Its totient is φ = 48472442574336.

The previous prime is 121221021221981. The next prime is 121221021222073. The reversal of 121221021222020 is 20222120122121.

It can be written as a sum of positive squares in 4 ways, for example, as 59818344629824 + 61402676592196 = 7734232^2 + 7835986^2 .

It is a super-2 number, since 2×121221021222020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121221021221983 and 121221021222001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 997807397 + ... + 997928876.

It is an arithmetic number, because the mean of its divisors is an integer number (10610331900721).

Almost surely, 2^{121221021222020} is an apocalyptic number.

121221021222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021222020 is an abundant number, since it is smaller than the sum of its proper divisors (133426944395284).

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

121221021222020 is a wasteful number, since it uses less digits than its factorization.

121221021222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995739319 (or 1995739317 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121221021222020 its reverse (20222120122121), we get a palindrome (141443141344141).

The spelling of 121221021222020 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, twenty".