202111021121020 has 192 divisors, whose sum is σ = 482948774364672. Its totient is φ = 70410695040000.

The previous prime is 202111021121003. The next prime is 202111021121027. The reversal of 202111021121020 is 20121120111202.

It is a junction number, because it is equal to n+sod(n) for n = 202111021120985 and 202111021121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202111021121027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 101245750 + ... + 103222690.

It is an arithmetic number, because the mean of its divisors is an integer number (2515358199816).

Almost surely, 2^{202111021121020} is an apocalyptic number.

202111021121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202111021121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241474387182336).

202111021121020 is an abundant number, since it is smaller than the sum of its proper divisors (280837753243652).

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

202111021121020 is a wasteful number, since it uses less digits than its factorization.

202111021121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977212 (or 1977210 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 202111021121020 its reverse (20121120111202), we get a palindrome (222232141232222).

The spelling of 202111021121020 in words is "two hundred two trillion, one hundred eleven billion, twenty-one million, one hundred twenty-one thousand, twenty".