21221222010122 has 8 divisors (see below), whose sum is σ = 33704293780836. Its totient is φ = 9986457416512.

The previous prime is 21221222010097. The next prime is 21221222010133. The reversal of 21221222010122 is 22101022212212.

It can be written as a sum of positive squares in 2 ways, for example, as 21194431195081 + 26790815041 = 4603741^2 + 163679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21221222010094 and 21221222010103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312076794233 + ... + 312076794300.

Almost surely, 2^{21221222010122} is an apocalyptic number.

21221222010122 is a deficient number, since it is larger than the sum of its proper divisors (12483071770714).

21221222010122 is a wasteful number, since it uses less digits than its factorization.

21221222010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624153588552.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221222010122 its reverse (22101022212212), we get a palindrome (43322244222334).

The spelling of 21221222010122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, ten thousand, one hundred twenty-two".