202121010104 has 64 divisors (see below), whose sum is σ = 421412167680. Its totient is φ = 90252144000.

The previous prime is 202121010061. The next prime is 202121010127. The reversal of 202121010104 is 401010121202.

It is a happy number.

It is a super-2 number, since 2×202121010104² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16149209 + ... + 16161719.

It is an arithmetic number, because the mean of its divisors is an integer number (6584565120).

Almost surely, 2^202121010104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202121010104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210706083840).

202121010104 is an abundant number, since it is smaller than the sum of its proper divisors (219291157576).

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

202121010104 is a wasteful number, since it uses less digits than its factorization.

202121010104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17572 (or 17568 counting only the distinct ones).

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

Adding to 202121010104 its reverse (401010121202), we get a palindrome (603131131306).

The spelling of 202121010104 in words is "two hundred two billion, one hundred twenty-one million, ten thousand, one hundred four".