202121202021 has 8 divisors (see below), whose sum is σ = 269497122720. Its totient is φ = 134746374672.

The previous prime is 202121201999. The next prime is 202121202037. The reversal of 202121202021 is 120202121202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202121202021 - 2⁶ = 202121201957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121202061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383506 + ... + 742508.

It is an arithmetic number, because the mean of its divisors is an integer number (33687140340).

Almost surely, 2^202121202021 is an apocalyptic number.

It is an amenable number.

202121202021 is a deficient number, since it is larger than the sum of its proper divisors (67375920699).

202121202021 is a wasteful number, since it uses less digits than its factorization.

202121202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546675.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202121202021 its reverse (120202121202), we get a palindrome (322323323223).

The spelling of 202121202021 in words is "two hundred two billion, one hundred twenty-one million, two hundred two thousand, twenty-one".