221012221121101 has 4 divisors (see below), whose sum is σ = 221012589004704. Its totient is φ = 221011853237500.

The previous prime is 221012221121053. The next prime is 221012221121117. The reversal of 221012221121101 is 101121122210122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221012221121101 - 2¹³ = 221012221112909 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 (221012221161101) 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, 183039175 + ... + 184242676.

It is an arithmetic number, because the mean of its divisors is an integer number (55253147251176).

Almost surely, 2^{221012221121101} is an apocalyptic number.

It is an amenable number.

221012221121101 is a deficient number, since it is larger than the sum of its proper divisors (367883603).

221012221121101 is an equidigital number, since it uses as much as digits as its factorization.

221012221121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367883602.

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

Adding to 221012221121101 its reverse (101121122210122), we get a palindrome (322133343331223).

The spelling of 221012221121101 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".