221001002022101 has 4 divisors (see below), whose sum is σ = 252572573739552. Its totient is φ = 189429430304652.

The previous prime is 221001002022001. The next prime is 221001002022103. The reversal of 221001002022101 is 101220200100122.

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 221001002022101 - 2¹⁸ = 221001001759957 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 (221001002022103) 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, 15785785858715 + ... + 15785785858728.

It is an arithmetic number, because the mean of its divisors is an integer number (63143143434888).

Almost surely, 2^{221001002022101} is an apocalyptic number.

It is an amenable number.

221001002022101 is a deficient number, since it is larger than the sum of its proper divisors (31571571717451).

221001002022101 is an equidigital number, since it uses as much as digits as its factorization.

221001002022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31571571717450.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221001002022101 its reverse (101220200100122), we get a palindrome (322221202122223).

The spelling of 221001002022101 in words is "two hundred twenty-one trillion, one billion, two million, twenty-two thousand, one hundred one".