202221122021 has 4 divisors (see below), whose sum is σ = 205536222444. Its totient is φ = 198906021600.

The previous prime is 202221121987. The next prime is 202221122029. The reversal of 202221122021 is 120221122202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6601562500 + 195619559521 = 81250^2 + 442289^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221122021 - 2⁶ = 202221121957 is a prime.

It is a super-2 number, since 2×202221122021² (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 (202221122029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657550120 + ... + 1657550241.

It is an arithmetic number, because the mean of its divisors is an integer number (51384055611).

Almost surely, 2^202221122021 is an apocalyptic number.

It is an amenable number.

202221122021 is a deficient number, since it is larger than the sum of its proper divisors (3315100423).

202221122021 is an equidigital number, since it uses as much as digits as its factorization.

202221122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315100422.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202221122021 its reverse (120221122202), we get a palindrome (322442244223).

The spelling of 202221122021 in words is "two hundred two billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-one".