221011122121001 has 4 divisors (see below), whose sum is σ = 221014669087104. Its totient is φ = 221007575154900.

The previous prime is 221011122120989. The next prime is 221011122121039. The reversal of 221011122121001 is 100121221110122.

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 221011122121001 - 2⁴² = 216613075609897 is a prime.

It is a super-2 number, since 2×221011122121001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011122121051) 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, 1773389585 + ... + 1773514206.

It is an arithmetic number, because the mean of its divisors is an integer number (55253667271776).

Almost surely, 2^{221011122121001} is an apocalyptic number.

It is an amenable number.

221011122121001 is a deficient number, since it is larger than the sum of its proper divisors (3546966103).

221011122121001 is an equidigital number, since it uses as much as digits as its factorization.

221011122121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546966102.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221011122121001 its reverse (100121221110122), we get a palindrome (321132343231123).

The spelling of 221011122121001 in words is "two hundred twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, one".