20210121220100 has 144 divisors (see below), whose sum is σ = 51372844010880. Its totient is φ = 6758180352000.

The previous prime is 20210121220049. The next prime is 20210121220129. The reversal of 20210121220100 is 102212101202.

It is a super-2 number, since 2×20210121220100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2603636 + ... + 6870164.

Almost surely, 2^{20210121220100} is an apocalyptic number.

20210121220100 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 20210121220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25686422005440).

20210121220100 is an abundant number, since it is smaller than the sum of its proper divisors (31162722790780).

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

20210121220100 is a wasteful number, since it uses less digits than its factorization.

20210121220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266718 (or 4266711 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20210121220100 its reverse (102212101202), we get a palindrome (20312333321302).

The spelling of 20210121220100 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, two hundred twenty thousand, one hundred".