221101220121001 has 4 divisors (see below), whose sum is σ = 241201331041104. Its totient is φ = 201001109200900.

The previous prime is 221101220120999. The next prime is 221101220121053. The reversal of 221101220121001 is 100121022101122.

221101220121001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221101220121001 - 2¹ = 221101220120999 is a prime.

It is a super-4 number, since 4×221101220121001⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101220121071) 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, 10050055460035 + ... + 10050055460056.

It is an arithmetic number, because the mean of its divisors is an integer number (60300332760276).

Almost surely, 2^{221101220121001} is an apocalyptic number.

It is an amenable number.

221101220121001 is a deficient number, since it is larger than the sum of its proper divisors (20100110920103).

221101220121001 is a wasteful number, since it uses less digits than its factorization.

221101220121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20100110920102.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221101220121001 its reverse (100121022101122), we get a palindrome (321222242222123).

The spelling of 221101220121001 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twenty million, one hundred twenty-one thousand, one".