221220210222101 has 4 divisors (see below), whose sum is σ = 221304228534732. Its totient is φ = 221136191909472.

The previous prime is 221220210222091. The next prime is 221220210222131. The reversal of 221220210222101 is 101222012022122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46859145199876 + 174361065022225 = 6845374^2 + 13204585^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220210222101 - 2¹⁴ = 221220210205717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220210222131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42009152366 + ... + 42009157631.

It is an arithmetic number, because the mean of its divisors is an integer number (55326057133683).

Almost surely, 2^{221220210222101} is an apocalyptic number.

It is an amenable number.

221220210222101 is a deficient number, since it is larger than the sum of its proper divisors (84018312631).

221220210222101 is an equidigital number, since it uses as much as digits as its factorization.

221220210222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84018312630.

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

Adding to 221220210222101 its reverse (101222012022122), we get a palindrome (322442222244223).

The spelling of 221220210222101 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred ten million, two hundred twenty-two thousand, one hundred one".