1202122221 has 4 divisors (see below), whose sum is σ = 1602829632.
Its totient is φ = 801414812.
The previous prime is 1202122217. The next prime is 1202122231. The reversal of 1202122221 is 1222212021.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 1202122221 - 22 = 1202122217 is a prime.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 1202122221.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1202122231) 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, 200353701 + ... + 200353706.
It is an arithmetic number, because the mean of its divisors is an integer number (400707408).
Almost surely, 21202122221 is an apocalyptic number.
It is an amenable number.
1202122221 is a deficient number, since it is larger than the sum of its proper divisors (400707411).
1202122221 is an equidigital number, since it uses as much as digits as its factorization.
1202122221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 400707410.
The product of its (nonzero) digits is 64, while the sum is 15.
The square root of 1202122221 is about 34671.6342418410.
The cubic root of 1202122221 is about 1063.2846436783.
Adding to 1202122221 its reverse (1222212021), we get a palindrome (2424334242).
The spelling of 1202122221 in words is "one billion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".