1402212221 has 2 divisors, whose sum is σ = 1402212222. Its totient is φ = 1402212220.

The previous prime is 1402212211. The next prime is 1402212239. The reversal of 1402212221 is 1222122041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 918696100 + 483516121 = 30310^2 + 21989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1402212221 is a prime.

It is a super-3 number, since 3×1402212221³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1402212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1402212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701106110 + 701106111.

It is an arithmetic number, because the mean of its divisors is an integer number (701106111).

Almost surely, 2^1402212221 is an apocalyptic number.

It is an amenable number.

1402212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1402212221 is an equidigital number, since it uses as much as digits as its factorization.

1402212221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1402212221 is about 37446.1242453742. The cubic root of 1402212221 is about 1119.2778670326.

Adding to 1402212221 its reverse (1222122041), we get a palindrome (2624334262).

The spelling of 1402212221 in words is "one billion, four hundred two million, two hundred twelve thousand, two hundred twenty-one".