21020112002222 has 4 divisors (see below), whose sum is σ = 31530168003336. Its totient is φ = 10510056001110.

The previous prime is 21020112002171. The next prime is 21020112002233. The reversal of 21020112002222 is 22220021102012.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21020112002222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255028000554 + ... + 5255028000557.

It is an arithmetic number, because the mean of its divisors is an integer number (7882542000834).

Almost surely, 2^{21020112002222} is an apocalyptic number.

21020112002222 is a deficient number, since it is larger than the sum of its proper divisors (10510056001114).

21020112002222 is a wasteful number, since it uses less digits than its factorization.

21020112002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510056001113.

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

Adding to 21020112002222 its reverse (22220021102012), we get a palindrome (43240133104234).

The spelling of 21020112002222 in words is "twenty-one trillion, twenty billion, one hundred twelve million, two thousand, two hundred twenty-two".