221100102121210 has 16 divisors (see below), whose sum is σ = 428594044112136. Its totient is φ = 81636960783168.

The previous prime is 221100102121187. The next prime is 221100102121277. The reversal of 221100102121210 is 12121201001122.

It can be written as a sum of positive squares in 4 ways, for example, as 175039488602001 + 46060613519209 = 13230249^2 + 6786797^2 .

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, 850385008029 + ... + 850385008288.

Almost surely, 2^{221100102121210} is an apocalyptic number.

221100102121210 is a deficient number, since it is larger than the sum of its proper divisors (207493941990926).

221100102121210 is a wasteful number, since it uses less digits than its factorization.

221100102121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700770016337.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221100102121210 its reverse (12121201001122), we get a palindrome (233221303122332).

The spelling of 221100102121210 in words is "two hundred twenty-one trillion, one hundred billion, one hundred two million, one hundred twenty-one thousand, two hundred ten".