21220022220202 has 12 divisors (see below), whose sum is σ = 34466840825670. Its totient is φ = 9793856409168.

The previous prime is 21220022220197. The next prime is 21220022220337. The reversal of 21220022220202 is 20202222002212.

It can be written as a sum of positive squares in 3 ways, for example, as 7406230230721 + 13813791989481 = 2721439^2 + 3716691^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21220022220202.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31390565077 + ... + 31390565752.

Almost surely, 2^{21220022220202} is an apocalyptic number.

21220022220202 is a deficient number, since it is larger than the sum of its proper divisors (13246818605468).

21220022220202 is a wasteful number, since it uses less digits than its factorization.

21220022220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62781130857 (or 62781130844 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21220022220202 its reverse (20202222002212), we get a palindrome (41422244222414).

The spelling of 21220022220202 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, two hundred twenty thousand, two hundred two".