21020021222102 has 16 divisors (see below), whose sum is σ = 36042363783072. Its totient is φ = 9006570101760.

The previous prime is 21020021222093. The next prime is 21020021222119. The reversal of 21020021222102 is 20122212002012.

It is a happy number.

It is a super-2 number, since 2×21020021222102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167470193 + ... + 167595660.

It is an arithmetic number, because the mean of its divisors is an integer number (2252647736442).

Almost surely, 2^{21020021222102} is an apocalyptic number.

21020021222102 is a deficient number, since it is larger than the sum of its proper divisors (15022342560970).

21020021222102 is a wasteful number, since it uses less digits than its factorization.

21020021222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335070343.

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

Adding to 21020021222102 its reverse (20122212002012), we get a palindrome (41142233224114).

The spelling of 21020021222102 in words is "twenty-one trillion, twenty billion, twenty-one million, two hundred twenty-two thousand, one hundred two".