210121100002020 has 96 divisors (see below), whose sum is σ = 593778045168000. Its totient is φ = 55514368272384.

The previous prime is 210121100002019. The next prime is 210121100002027. The reversal of 210121100002020 is 20200001121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210121100001987 and 210121100002005.

It is not an unprimeable number, because it can be changed into a prime (210121100002027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93384667 + ... + 95608253.

It is an arithmetic number, because the mean of its divisors is an integer number (6185187970500).

Almost surely, 2^{210121100002020} is an apocalyptic number.

210121100002020 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 210121100002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296889022584000).

210121100002020 is an abundant number, since it is smaller than the sum of its proper divisors (383656945165980).

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

210121100002020 is a wasteful number, since it uses less digits than its factorization.

210121100002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238157 (or 2238155 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210121100002020 its reverse (20200001121012), we get a palindrome (230321101123032).

The spelling of 210121100002020 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred million, two thousand, twenty".