21220122202012 has 12 divisors (see below), whose sum is σ = 39089698793320. Its totient is φ = 10051636832496.

The previous prime is 21220122202001. The next prime is 21220122202021. The reversal of 21220122202012 is 21020222102212.

It is a super-2 number, since 2×21220122202012² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139606067043 + ... + 139606067194.

Almost surely, 2^{21220122202012} is an apocalyptic number.

It is an amenable number.

21220122202012 is a deficient number, since it is larger than the sum of its proper divisors (17869576591308).

21220122202012 is a wasteful number, since it uses less digits than its factorization.

21220122202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279212134260 (or 279212134258 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21220122202012 its reverse (21020222102212), we get a palindrome (42240344304224).

The spelling of 21220122202012 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred two thousand, twelve".