21121210222202 has 16 divisors (see below), whose sum is σ = 31790540313000. Its totient is φ = 10524364803072.

The previous prime is 21121210222199. The next prime is 21121210222219. The reversal of 21121210222202 is 20222201212112.

It can be written as a sum of positive squares in 4 ways, for example, as 20937039641401 + 184170580801 = 4575701^2 + 429151^2 .

It is a super-2 number, since 2×21121210222202² (a number of 27 digits) contains 22 as substring.

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, 33909674 + ... + 34526922.

Almost surely, 2^{21121210222202} is an apocalyptic number.

21121210222202 is a deficient number, since it is larger than the sum of its proper divisors (10669330090798).

21121210222202 is a wasteful number, since it uses less digits than its factorization.

21121210222202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675937.

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

Adding to 21121210222202 its reverse (20222201212112), we get a palindrome (41343411434314).

The spelling of 21121210222202 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred twenty-two thousand, two hundred two".