2102201221221 has 6 divisors (see below), whose sum is σ = 3036512875110. Its totient is φ = 1401467480808.

The previous prime is 2102201221213. The next prime is 2102201221229. The reversal of 2102201221221 is 1221221022012.

It is a happy number.

2102201221221 is a `hidden beast` number, since 2 + 1 + 0 + 220 + 1 + 221 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (2102201221213) and next prime (2102201221229).

It can be written as a sum of positive squares in only one way, i.e., 1229191298721 + 873009922500 = 1108689^2 + 934350^2 .

It is not a de Polignac number, because 2102201221221 - 2³ = 2102201221213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102201221194 and 2102201221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102201221229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116788956726 + ... + 116788956743.

It is an arithmetic number, because the mean of its divisors is an integer number (506085479185).

Almost surely, 2^{2102201221221} is an apocalyptic number.

It is an amenable number.

2102201221221 is a deficient number, since it is larger than the sum of its proper divisors (934311653889).

2102201221221 is a wasteful number, since it uses less digits than its factorization.

2102201221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233577913475 (or 233577913472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2102201221221 its reverse (1221221022012), we get a palindrome (3323422243233).

The spelling of 2102201221221 in words is "two trillion, one hundred two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".