21210122221202 has 16 divisors (see below), whose sum is σ = 33792931802520. Its totient is φ = 9949747438848.

The previous prime is 21210122221081. The next prime is 21210122221229. The reversal of 21210122221202 is 20212222101212.

It can be written as a sum of positive squares in 4 ways, for example, as 13932758140921 + 7277364080281 = 3732661^2 + 2697659^2 .

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, 983943677 + ... + 983965232.

Almost surely, 2^{21210122221202} is an apocalyptic number.

21210122221202 is a deficient number, since it is larger than the sum of its proper divisors (12582809581318).

21210122221202 is a wasteful number, since it uses less digits than its factorization.

21210122221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967909245.

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

Adding to 21210122221202 its reverse (20212222101212), we get a palindrome (41422344322414).

The spelling of 21210122221202 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred two".