221012212112101 has 4 divisors (see below), whose sum is σ = 221062752297612. Its totient is φ = 220961671926592.

The previous prime is 221012212112089. The next prime is 221012212112137. The reversal of 221012212112101 is 101211212210122.

It is a happy number.

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 63305080689601 + 157707131422500 = 7956449^2 + 12558150^2 .

It is a cyclic number.

It is not a de Polignac number, because 221012212112101 - 2⁴⁵ = 185827840023269 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 (221012212110101) 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, 25270086196 + ... + 25270094941.

It is an arithmetic number, because the mean of its divisors is an integer number (55265688074403).

Almost surely, 2^{221012212112101} is an apocalyptic number.

It is an amenable number.

221012212112101 is a deficient number, since it is larger than the sum of its proper divisors (50540185511).

221012212112101 is an equidigital number, since it uses as much as digits as its factorization.

221012212112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50540185510.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221012212112101 its reverse (101211212210122), we get a palindrome (322223424322223).

The spelling of 221012212112101 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, one hundred twelve thousand, one hundred one".