21210212022122 has 16 divisors (see below), whose sum is σ = 32591897585352. Its totient is φ = 10346255623680.

The previous prime is 21210212022107. The next prime is 21210212022151. The reversal of 21210212022122 is 22122021201212.

It can be written as a sum of positive squares in 4 ways, for example, as 19861898575561 + 1348313446561 = 4456669^2 + 1161169^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21210212022094 and 21210212022103.

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 7 ways as a sum of consecutive naturals, for example, 2197508 + ... + 6873824.

Almost surely, 2^{21210212022122} is an apocalyptic number.

21210212022122 is a deficient number, since it is larger than the sum of its proper divisors (11381685563230).

21210212022122 is a wasteful number, since it uses less digits than its factorization.

21210212022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731673.

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

Adding to 21210212022122 its reverse (22122021201212), we get a palindrome (43332233223334).

The spelling of 21210212022122 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, twenty-two thousand, one hundred twenty-two".