202121020 has 48 divisors (see below), whose sum is σ = 436101120. Its totient is φ = 78659136.

The previous prime is 202120979. The next prime is 202121053. The reversal of 202121020 is 20121202.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 202120988 and 202121006.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 120709 + ... + 122371.

It is an arithmetic number, because the mean of its divisors is an integer number (9085440).

Almost surely, 2^202121020 is an apocalyptic number.

202121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121020 is an abundant number, since it is smaller than the sum of its proper divisors (233980100).

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

202121020 is a wasteful number, since it uses less digits than its factorization.

202121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834 (or 1832 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 202121020 is about 14216.9272348141. The cubic root of 202121020 is about 586.8635824569.

Adding to 202121020 its reverse (20121202), we get a palindrome (222242222).

The spelling of 202121020 in words is "two hundred two million, one hundred twenty-one thousand, twenty".