202121224421 has 8 divisors (see below), whose sum is σ = 203742394200. Its totient is φ = 200505260032.

The previous prime is 202121224391. The next prime is 202121224433. The reversal of 202121224421 is 124422121202.

It can be written as a sum of positive squares in 4 ways, for example, as 94963201921 + 107158022500 = 308161^2 + 327350^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202121224421 is a prime.

It is a super-2 number, since 2×202121224421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121224441) 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, 1223360 + ... + 1378713.

It is an arithmetic number, because the mean of its divisors is an integer number (25467799275).

Almost surely, 2^202121224421 is an apocalyptic number.

It is an amenable number.

202121224421 is a deficient number, since it is larger than the sum of its proper divisors (1621169779).

202121224421 is a wasteful number, since it uses less digits than its factorization.

202121224421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602695.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 202121224421 its reverse (124422121202), we get a palindrome (326543345623).

The spelling of 202121224421 in words is "two hundred two billion, one hundred twenty-one million, two hundred twenty-four thousand, four hundred twenty-one".