121121221022020 has 24 divisors (see below), whose sum is σ = 254377795455000. Its totient is φ = 48444063397632.

The previous prime is 121121221022003. The next prime is 121121221022047. The reversal of 121121221022020 is 20220122121121.

It can be written as a sum of positive squares in 4 ways, for example, as 13204735004224 + 107916486017796 = 3633832^2 + 10388286^2 .

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, 276338745 + ... + 276776704.

It is an arithmetic number, because the mean of its divisors is an integer number (10599074810625).

Almost surely, 2^{121121221022020} is an apocalyptic number.

121121221022020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121221022020 is an abundant number, since it is smaller than the sum of its proper divisors (133256574432980).

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

121121221022020 is a wasteful number, since it uses less digits than its factorization.

121121221022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553126407 (or 553126405 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121121221022020 its reverse (20220122121121), we get a palindrome (141341343143141).

The spelling of 121121221022020 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, twenty".